We definitely take sunscreen, hats, water, towels, money for tips, big ziploc baggie to keep everything dry, our bubba mugs and a drawstring bag to keep everything in one place! Above all else we bring our partying attitudes and big smiles!!!
A party attitude and don't judge others for what they look like or do. Everyone is there for one reason, to have a Blast!!!
We take a bag with a clip tie. Wrap it around a post on the boat and don't have to think about it going overboard rest of the trip. Also sunscreen. There's not much shade on the boat.
Don't forget your giant foam-filled strap-on...useful if you decide to challenge Chinos to a sword fight.