In this eco park the main attraction is the river which runs towards the sea.
There are other things to see such as cenotes (basically water in a lime staone cavern some of which have collapsed and are now open) and wildlife but its the river thats the star.
You can walk, cycle or get a bus to the start and either take an inflatable ring (a WASTE of a journey) or leave a $15 deposit for a snorkel.
There are loads of fish to see on the paddle down and you can also climb up 14 foot walls and jump back in with an appropriately stupid grin on your face.
There are a couple of zip lines as well which are also fun bit had a bit of a wait when we were there.
Out package also included inclusive meals and drinks which is the way forward if you are going early (recommended)