Sunscreen - Neutrogena Ultra Sheer Dry Touch - it's pretty inexpensive, feels very lightweight and completely non-sticky on the skin, and comes in both lotion and spray forms.
Fabrics - I don't really pay that much attention to fabrics as long as it's not like leather or something.
Be sure to stock up on tank tops, light dresses, breathable shorts/pants, and sandals or flip flops!
Bug spray - I really don't think you'll need to be wearing this on a regular basis, except if you're going to be outdoors a lot at night or something.
Makeup - I would go for as less makeup as possible. Sweating under a full face of foundation, blush, eyeshadow, etc. just feels gross. For foundation, I would use the mineral powder forms if possible. They just feel lighter on the skin.
Hair - I don't know much about anti-frizz products, but I would learn to style your hair up, especially during the summertime. I never go outside during the summer without bringing a ponytail holder or some hair clips with me. Things like ponytails, buns, hair twists can be dressed up/down and just keep you so much cooler.
This is all pretty good advice. I have a little bit more to add:
Sunscreen: I'm fairly pale, and I almost never use sunscreen. I just spray or rub in something with a 30 or 45 SPF when I'm going to the beach or laying out at the pool. You're not going to get sunburned walking to class unless you're one of those super-pale people who can't tan at all. During the less humid parts of the year, I wear Olay Regenerist (SPF 15) on my face because I don't want to have sun-damaged skin and it's a nice moisturizer. I can't wear it during the summer because it makes my skin too oily.
Fabrics: Flip flops are essential. I wear Reefs (JCPenny's has them right now), which my podiatrist says are one of the few flip flop brands that are actually good for your feet. Also, be sure to use a deodorant that's also an antiperspirant for most of the year. I can get away with using a non-antiperspirant one during the winter. You can't really wear layers in Florida because it's just too darn hot, so don't buy shirts that require a cami to be worn underneath.
Bugspray: Ditto. Bugs aren't bad except when it gets dusky or dark outside, and even then it's not that bad unless you're walking around in a grassy area or something. If you go camping, you will probably get ticks unless you apply bugspray with Deet very librally.
Make-up: The best make-up I've found is Bare Minerals with primer. My face is prone to getting pretty oily, and it seems to take longer to do that when I'm wearing this make-up. Aside from that, I just wear chapstick and a little bit of Estee Lauder eyebrow pencil/gel stuff. You really don't need much else, and if you apply too much then it'll just make you sweatier. Your best bet is just to have good eyebrow maintenance and to take care of your skin; that way, you'll look good and clean-cut without much make-up.
Hair:
1) Most people's hair is a little bit frizzy in Florida, but it is SOOO much easier to keep it frizz-free if you don't highlight your hair. I battled with my highlighted hair for years, and when I finally grew it out, I was amazed by how much easier it was to work with.
2) Up north some people can get away with washing their hair only a few times/week, but most people here have to wash their hair every day, which means that you have to be kind to your hair: don't use a very strong shampoo. I like Head and Shoulders; it smells nice, cleans my hair really well, and doesn't dry it out. Any old conditioner works; right now I'm using Pantene.
3) If you really want that shiny+straight look, you will have to use a straightening iron and some sort of smoothing/straightening serum. Redken hair products work well, and ceramic straightening irons work best. However, the combination of straightening your hair and getting slightly sweaty will make your hair really flat on your head, so you might need some hairspray to give you some lift. My sister uses White Rain. I don't like the whole crunchy hair thing, so I just let my hair be slightly frizzy and keep my natural volume.
4) Hair ties, crab clips, short hair cuts -- really, anything that will get your hair off the back of your neck -- will really help make the heat more bearable.
Allergies: Be prepared to have allergies. The humidity makes it really easy for mold to grow in your home, and it makes it really easy for dust mites to live in your mattress. My parents use a dehumidifier, HEPA air filter, and allergen-proof mattress covers and pillow covers (the ones that zip up and encase the whole mattress or pillow). 100% cotton sheets are definitely the way to go if you ever get sweaty at night. Wood and imitation-wood floors are better than carpet; they don't hold moisture, and sweeping is easier than vacuuming. I also take singulair and claratin, which really help prevent allergy headaches and congestion.
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