Reserva Natural Tanimboca

Tanimboca is the budget adventure of the Leticia forest, and it makes you earn it: the treehouse is suspended about twelve metres up in the canopy, and you reach it by a zipline and rope system rather than a staircase, so getting to bed is part of the experience. There's a shower, a toilet and bunk beds up there, and a strict one-night limit in the treehouse — they want you down again afterward. Bring cash, because that's all they take, and arrive before dusk, because you don't want to be working that rope rig in the dark. The reserve runs canopy tours, kayaking and night hikes from the ground cabins, with a price including a night walk and breakfast for around the cost of a city dinner. Verdict: cheap, genuinely thrilling, and not for anyone who balks at heights or cash machines.