Really cool how close the ship gets to the beach where most people relax. easy disembarkation and there aren't a bunch of pushy locals trying to hustle you for a banana boat ride. If you don't do an excursion either relax on the beach or hit up Margaritaville - out of all the Margaritavilles I've been to, this one was the best by far.
If you're adventurous, skip the long line of people waiting for a tour guide and climb the falls by yourself. you won't be linked up to anyone so you can see much more of the falls and go at your own pace. plus, you don't have to wait in the endless crowds of people.
Fun Port. Senor frogs is awesome if you're young and looking to have a fun time. If you're slightly more refined, go to the Atlantis resort and buy a pass for one of the exclusive beaches. you won't find any drunk college kids there and you can walk around all the cool aquariums as well