Carnival's Cozumel Snorkel and Sea Lion Show at Chankanaab

[cjnix29]

We are going to go to Chankanaab when we are in port next month. Priced out doing it on our own (even with coupons), and if we rented snorkel equipment, the difference in the two is only a handful of dollars. So I will probably just book through Carnival, that way I don't have to carry as much cash. But what I am wondering.....on the description, it says flexible return times...is this true? I would love to spend more time there than just three hours, but wondered how flexible the times are? Anyone one done this? It's the 39.99 one.

 

thanks!!