Theme night staples are White Night, pretty self explanatory, Casual Elegant night, kinda hard to describe, but dress up without going over the top, kinda like you're going out for a nice dinner. Last Casual Elegant night my partner and I both wore sun dresses. Not everyone wears dresses, though, just wear what you're comfortable in. Shorts are perfectly fine, too. There will also be some sort of fiesta night, wear something mexian or tropical themed. They usually have local vendors set up for that one, so you can shop around the pool before the show. They will have a party on Halloween. If you like to wear a costume on Halloween, definitely bring it. You'll see some pretty good ones when you're there!
I think the theme nights will be in the packet they send out prior to the trip. They'll provide a little description on what each of them means. Again, partake as much or as little as you want.There are no rules regarding the theme nights!