We just got back from Cozumel and did the Sea Trek helmet dive. My 11y/o son and I did the dive and it was wonderful. It was just us and the guide and we walked out to the pier after a quick lesson and walked down the ladder to the sea floor. Our guide fed the fish and taught us how to "catch" them. It was great for my son who was very much a beginner. Afterwards, he took us and my 8 yr old daughter on a snorke tour. There were about 8 other people on the snorkle tour. By the time we finished the swim with the dolphins, sea trek and snorkeling, it was about 4 hours. Hope that helps!