our tour guides were really nice and helpful, it's a little scary for first timers like myself (especially if you can't swim), but once you get the hang of it, it's pretty simple and easy (except for all the arm work you're gonna need to put into it!). my husband and I went on a double around 3pm, the water was really nice and calm and the sun wasn't beating down too hard so it was fairly cool. you learn a lot of fun facts about the caves, meet sea lions, and even kayak through one of the caves! great fun for all!