We just got back yersterday fron AC and I would suggest a guide named Daniel for a trip to the ruins where he takes you to the mainland, down the river and points out LOTs of animals. We saw crocks, Manatee, Iguana, Dolphin, Monkeys, birds, Toucan,etc. It was a great adventure. All day long. & to about 6:30. We booked it at the dive shop at Banyan Tree Resort behind Rico's Restaurant. It is a long day, but if you like animals it's worth it. Cost was $115. pp Good Luck