Been on 3 (which around here still qualifies me as a virgin). Good tips already with sunscreen, towels, water and tip money. Maybe a small bag to keep an extra suit for the misses (sometimes they do go missing), something for headaches (it's a long but fun day in the sun), and that's about it. Honestly, the less stuff you can take (excluding the essentials) the better. Don't have to worry about keeping an eye on your stuff and you can just have fun. Have a great time!
I forgot you have to add a camera, no one including your self after your drunken loss of naked memory will believe what happens on the Boobs Cruise with out the pics to prove it. T