Bring as much of your own gear as you can. Reg, mask, fins, computer... Come dressed in swim wear (bathing suit) so you can easily put on a wet suit in front of everyone. Dont pee in your suit right before you get back on the boat, Pee early in the dive or not at all. Most boats have snacks and drinks, dont come to the boats starving though... Keep your stuff next to your tanks or under them. Things can easily go missing into another divers bag (usually on accident). If you get sick do not go to the bathroom or marine head. Puke off the back or side.