I thought about the towels too but since the hotel provides towels, I thought it would be too much to take down and more for people to pack home. I love the idea though! I'm thinking about a koozie, some kind of spanish for dummies, beach ball or float, sunscreen, chapstick, advil or tums, and maybe a shot glass. I'm trying to think of things that will fit in a small bag (cost reasons) and that won't break (that's why it's a maybe on the shot glasses) and that I can stuff in a suitcase. Not sure what else. There's a thread on here too about OOT bags. I'm looking through it now.
What about bridal party gifts, what are you doing? I'm on a tight budget as is so I can't do anything over the top.