Stay a few nights on an island in the Brokopondo Lake. It is really a good place to unwind. The water surrounding you is warm. So swimming is great. But you can also fish if you like; the lake has spots where piranhas are abundant. But there are other fish to catch too.
Also make a trip by boat between the trees. This lake was formed in 1964, when a dam blocked the water in the Suriname River. About 5000 Saramaccan people who live in this area had to move, because their home was vanishing in the lake. The forest died when the lake set. But the wood is extremely hard and today, 40 years later, you will see the tree tops still standing. When travelling by boat on the water keep in mind that there trees that are just under the water level and you can hit them. The wood is still being harvested by divers, who go down and saw the tree at the bottom of the lake.