This is a stunning natural reservation and a must see if you are in town and of course if you are looking to spend some time in the middle of nature and out of the city and its normal rhythm. The facilities are simple but very well kept, the river is absolutely beautiful but gotta be careful since its really strong. This is Colombia so everything is under your risk.. there are no life guards or anything, if you drown you drown..so don't be stupid! We went to the cave and it is absolutely amazing!! just make sure you are in shape to hike through the forest for 1 hr, cross the river fully dressed (shoes and pants strongly recommended) and then walk though the cave for 40 min.. the cave has a stream of water that goes back to the river.. you gotta swim and jump into wells.. slide through the rocks etc... they don't speak English and don't do a good job describing the adventure with all it takes.. so make sure you are in shape and are willing to go for it, once you cross the river there's no going back!
If you prefer to be with small groups definitely avoid weekends!