My husband and I just got back from PV and enjoyed Vallarta Adventures snorkeling around the Mariettas Islands. It was a day long cruise with the open bar starting after the snorkeling. We also stopped at a private beach for about an hour after a nice lunch. The crew entertained us all day and were very informative, even showing us an octopus while snorkeling. We also saw the dolphins in the bay in the morning feeding, very neat! The Vallarta Adventure office was not easy to find, hidden in the many shops in the marina, but worth the find. We also did thier Rythms of the night, very romantic and beautiful. Have fun!