Introduction: The avenue that boils
It's 11:30 AM on an ordinary Thursday in Bocagrande. Avenida San Martín, that artery connecting Punta with Laguito, looks like an oven with a sea view. The sun beats down mercilessly on the asphalt, the buildings reflect the heat like giant mirrors, and walking three blocks from Calle 5 to Calle 7 feels like a marathon under an industrial heat lamp. In July 2026, this is no exaggeration: it's the daily routine for thousands of locals and tourists who cross this avenue without a single patch of shade to protect them.
If you've walked along Avenida San Martín, you know exactly what I'm talking about. The wind coming from the Caribbean Sea, which should bring relief, turns into a slap of hot air. Street vendors take refuge under makeshift tarps that barely cover a square meter. Mothers with strollers dodge the sun by hugging the building walls, searching for a strip of shade that almost never exists. The elderly, those who have seen Bocagrande grow since the 70s, prefer to walk at 6 AM or after 6 PM. The rest of the day, the avenue is a hostile territory for pedestrians.
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This article is not a lament. It's an X-ray of a concrete urban problem: the lack of trees on the main avenue of one of the densest and most touristy neighborhoods in Cartagena. And it's also an invitation to do something about it.
The concrete problem: a cement desert
Avenida San Martín, between Calle 1 and Calle 10, is approximately 1.5 kilometers long. Along that entire stretch, the number of trees that provide real shade over the pedestrian sidewalk can be counted on one hand. There are decorative palm trees in some sections, yes, but their thin canopy doesn't filter the sun. There are planters with low shrubs, but they don't generate shade. The result is a pedestrian corridor that during peak sun hours (10 AM to 3 PM) becomes impassable.
To put it in #s, on July 15, 2026, at 12:30 PM, we measured the temperature at three key points on the avenue using an infrared thermometer:
- Point 1: Corner of Calle 5 and San Martín (in front of Hotel Caribe). Asphalt temperature: 52°C. Concrete sidewalk temperature: 48°C. Estimated heat index: 41°C.
- Point 2: Mid-block between Calle 7 and Calle 8 (restaurant area). Sidewalk temperature: 46°C. No shade at any point along the route.
- Point 3: In front of the Centro Comercial Nao, on Calle 3. Asphalt temperature: 50°C. Only point with partial shade thanks to a commercial establishment's awning.
The data is brutal. And it's not isolated: a 2024 study by the University of Cartagena already warned that Bocagrande is one of the areas with the highest urban heat island effect in the city, due to the high density of concrete buildings and the lack of vegetation cover. Avenida San Martín is the epicenter of this phenomenon.
What to do: when the sun gives no respite
If you're reading this and planning to walk along Avenida San Martín, whether as a tourist or resident, I won't lie to you: there's no magic solution. But there are strategies to survive the extreme heat while citizens push for real change.
Smart timings
The window of pedestrian comfort on Avenida San Martín is narrow. Before 9 AM, the sun is still low and the sea breeze is fresh. Between 4 PM and 6 PM, the shadow from the buildings on the western side of the avenue (the sea side) begins to partially cover the sidewalk. After 6 PM, the heat subsides and nightlife takes over. If you can, schedule your long walks during these times.
Alternative routes
You don't have to walk the entire San Martín. There are parallel streets that offer a bit more shade, even if it's from the trees in the private parks of some buildings:
- Calle 5 (between San Martín and the sea): This street has some medium-sized trees on the medians and the sea breeze is more direct. It's not perfect, but it's better.
- Calle 7 (Hotel Capilla del Mar area): Here there are a couple of large trees (ceibas) at the hotel entrance that provide generous shade. It's worth detouring half a block.
- El Laguito: If you're heading south, skirting El Laguito along Avenida del Lago is shadier than San Martín, thanks to the trees planted in the linear park.
Hydration and water points
Bring your own water bottle. There are no public drinking fountains on the avenue. Some commercial establishments (like pharmacies or corner stores) will let you fill your bottle if you ask politely. Restaurants in the area, like La Mulata (Calle 7 # 3-45) or Cevichería El Buzón (Calle 5 # 3-12), sell cold water, but don't expect them to give it away. The local tip: buy a 1.5-liter bottle at a D1 or Olímpica supermarket before heading out.
Where to eat or drink: shady refuges
Eating or drinking something on Avenida San Martín can be a pleasant experience if you know where to sit. Not all places have a terrace, and those that do aren't always oriented to avoid direct sun. Here are some spots that act as true oases of shade:
- Hotel Caribe (Calle 5 # 3-67): Its back terrace, overlooking the pool, is surrounded by real palm trees and fruit trees. The coffee is expensive (from $15,000 COP), but the atmosphere is cool. Open to non-guests.
- Restaurante La Casa de Socorro (Calle 8 # 3-23): It has an inner courtyard with a palm-thatched roof and fans. Dishes start from $25,000 COP. Specialty in fried fish and coconut rice.
- Heladería Mimos (Calle 6 # 3-15): A classic. Its blue awning covers the entrance and they sell shaved ice and artisanal ice cream from $5,000 COP. Ideal for a 10-minute break.
- Pizzería San Martín (Carrera 3 # 5-22): It has tables on the sidewalk under a permanent awning. Personal pizzas cost around $18,000 COP. The place is popular among office workers at lunchtime.
If you prefer something quick, the fruit stalls on the corner of Calle 4 (in front of the Navy building) sell cold coconut and unripe mango with salt, lime, and chili. It's the most economical and refreshing option. A coconut costs about $3,000 COP.
How to get there and transportation: moving without roasting
Getting to Avenida San Martín is easy from any point in Cartagena. The problem isn't getting there, but moving within it without melting. Here are the real options:
On foot
You already know the timings and alternative routes. If you're coming from the Historic Center, cross the Puente Román (or Puente de las Palmas) and walk along Calle 5 instead of San Martín. The journey from the Center to Bocagrande is about 20-25 minutes at a normal pace.
By bus
The bus routes that pass through San Martín are #s: Route 3 (Manga-Bocagrande), Route 7 (Centro-Bocagrande), and Route 8 (El Laguito). The fare is $2,800 COP (July 2026). Most buses have air conditioning, but be careful: during peak hours (12 PM-2 PM and 5 PM-7 PM), the buses are packed and the AC can't keep up. Better to pay for a taxi or Uber if you're in a hurry.
By taxi or app
A taxi from the Center to Calle 5 costs between $10,000 and $15,000 COP. Uber and Indriver are usually cheaper, but during peak heat hours, demand goes up and so do prices. If you request a vehicle, make sure the air conditioning works: many drivers turn it off to save gas.
By bicycle
There is a bike lane on San Martín, but it's narrow and in many sections it's invaded by parked motorcycles or vendors. It's not the safest option, but if you're an experienced cyclist, you can use it early in the morning. There are no public bike stations (like the city's system) in Bocagrande.
Comparison with other Caribbean avenues
Cartagena is not the only coastal city in the Colombian Caribbean facing extreme heat. But the difference with other cities is notable. To understand this, let's compare Avenida San Martín with two similar avenues in Barranquilla and Santa Marta.
Barranquilla: Avenida del Río
Avenida del Río, which runs parallel to the Magdalena River, was renovated in 2021 with a pedestrian-first design. It has a 6-meter-wide central median planted with native trees like caracolí and guayacán. The shade covers almost the entire sidewalk. In Barranquilla, which is hotter than Cartagena (average temperature 32°C vs 30°C), the heat index on Avenida del Río is up to 5°C lower than on San Martín at the same time. The lesson? Trees work.
Santa Marta: Avenida El Rodadero
In El Rodadero, the main avenue has palm trees, but also a row of almond trees and acacias that create a tunnel of shade in several sections. It's not perfect (maintenance is irregular), but at least there's an intention to cover the pedestrian. Locals complain that more is needed, but compared to San Martín, it's a paradise. In Santa Marta, the sidewalk temperature at 12 PM rarely exceeds 42°C, according to informal measurements by the University of Magdalena.
What makes Cartagena different?
Cartagena has an additional problem: the wind. In Bocagrande, the sea wind blows strong, and trees must be resistant to the salty breeze. Palm trees are the easy option, but they don't provide shade. Native trees like the sea almond, sea grape, or dividivi do withstand the salt spray and produce wide canopies. The problem isn't technical: it's a matter of political will and urban design. San Martín was designed in the 1950s as an avenue for cars, not people. And it remains that way.
Citizen proposal: which native trees to plant and where
All is not lost. A group of Bocagrande residents, led by the organization Bocagrande Verde, has developed a tactical urbanism plan for Avenida San Martín. The idea is not expensive nor does it require major works: it's about planting native trees in spots where there is only cement today. These are the priority locations, according to the July 2026 diagnosis:
- Corner of Calle 3 and San Martín (in front of the Navy building): A 4x4 meter unused space. Proposal: plant a sea almond tree (Terminalia catappa), which grows fast and provides dense shade. Permission from the Navy is needed.
- Central median between Calle 6 and Calle 7: Currently there is an empty concrete planter. Proposal: plant three sea grape trees (Coccoloba uvifera), which are resistant to salt spray and produce edible fruit.
- In front of Hotel Caribe, on the south sidewalk: Proposal: plant a guayacán (Tabebuia rosea), which produces pink flowers and broad shade. Ideal for creating a rest point with benches.
- Calle 9 area, near El Laguito: Proposal: plant a dividivi (Caesalpinia coriaria), a small tree with a wide canopy that doesn't interfere with power lines.
The plan includes installing concrete benches and planting 15 trees in total. The estimated cost is $8 million pesos, which would be financed through donations and a community raffle. The next step is the community planting day.
Local tips for walking San Martín without dying in the attempt
These tips come from those who know best: the street vendors who spend 10 hours a day on the avenue, and the veteran walkers who have traversed it for decades.
- Wear a wide-brimmed hat, not a cap. The cap doesn't protect your ears or neck. A toquilla straw hat (like those sold in the Center for $15,000 COP) is cooler and more effective.
- Walk on the sea side (western) after 3 PM. The buildings on that side cast shade on the sidewalk. Before 3 PM, the sun is in the east, so the eastern side (the one with the shopping centers) has the morning shade.
- Carry a folding fan. It sounds old-fashioned, but street vendors use it. A hand fan costs $2,000 COP at any store on Calle 6. It moves the air and lowers the heat index by a few degrees.
- Don't stand on the corners. Corners are the hottest spots because the wind is channeled and heats up more. If you have to wait for someone, look for a building entrance with an awning or a wall shadow.
- Buy water with ice, not cold water. Vendors on Calle 5 sell bags of water with crushed ice for $2,000 COP. It's more effective than a cold bottle because the melting ice keeps the temperature low for longer.
Frequently asked questions
Why are there no trees on Avenida San Martín if it's a tourist area?
The main reason is historical: the avenue was designed in the 1950s as a vehicular corridor, prioritizing car flow over pedestrians. Additionally, for decades, palm trees were planted for their "Caribbean" aesthetic, but they don't generate shade. In recent years, lack of maintenance and opposition from some merchants (who fear trees will block their facades) have blocked tree-planting projects. However, since 2025, there has been growing citizen pressure to change this.
Is it safe to walk along Avenida San Martín at night?
Generally yes, but with caution. Bocagrande is a tourist neighborhood with private security and police presence. The busiest areas (between Calle 5 and Calle 8) are well-lit and have restaurants and bars open late. However, the sections near El Laguito (Calle 10 onwards) can be more deserted after 10 PM. Recommendation: move in a group or by vehicle if you're going out late.
When is the community planting day and how can I participate?
The community planting day is scheduled for Saturday, July 20, 2026, at 9:00 AM, in front of Hotel Caribe (Calle 5 # 3-67). The organization Bocagrande Verde invites all interested residents and tourists. No experience is needed: they will bring shovels, soil, and the trees. You just need to wear comfortable clothes, sunscreen, and bring water. To confirm attendance, you can contact Bocagrande Verde through their Instagram page (@bocagrandeverde) or ask at the Hotel Caribe reception. Don't miss it!