First of all, thanks for all the help here. I should have pointed out one thing; although I don't dive, I had to pay full freight, so to speak, for this trip, even though I will not be using the services of the dive crew aside from possibly a little bit of snorkeling. (This is Rocio Del Mar's rules, they don't allow a less expensive package for a non-diver like dive resorts do). I think what would make the most sense for me is to concentrate my tip on the boat, cabin, and kitchen/dining crew. And tip the dive team according to my usage of any services, including possibly focusing that tip on any particular team member who may assist me with the snorkeling.