planning a trip
Not been there specifically but of course if first time out plenty of sun screen - apply and let dry some before going on the water. Towel. Sandals. I have short shorts for walking around outside the nude area - just enough to stay legal. And, at least what I do, make sure to drive there naked - both gets you in the mood, begins the sunning on parts not seen by the sun possibly ever and is just an awesome experience. Keep the shorts handy if need to go in the store. Maybe a hat if you burn easy like me. Sunglasses since the sun is brutal on the eyes. And for us guys might need to work out a load before venturing out just so you don't end up walking around with a perpetual hard on (common when first going out and seeing all that nakedness). I go to Hippie Hollow in Austin TX near my house and have to remember that since don't go regularly enough. After you are naked and everyone else naked for a while then no big deal at all.
I am envious you'll getting to go. If ever in or near Austin and want to meet let me know. AustinJohn