I would say either try to bring a car or plan on hooking up with someone down there who has one. There's not much to do on the base (other than drink and hang out).
The one downside to brining a car is parking. I was always allowed to park in any of the lots - but the basic students are usually prohibited from parking in most areas and have to leave their cars in the dorm lots - often far away from the classrooms, training areas, and dining hall. A lot of the students used bikes to get around on the base.
The food at FLETC is pretty good - especially as compared to the cuisine served at Quantico lately. Lots of variety and its decent. It is nice to get an off-campus meal though. I recommend the King and Prince Resort - Friday nights - they have a great seafood buffet and the place is right on the water.
Do you know what dorm you're staying in? I strongly recommend (not that you have a choice...185, 186, 187). On-base contract housing that rivals many hotels. Brand new construction, air conditioned single rooms, very clean, Microwave, telephone, TV, private bathrooms, in-ground pools in the courtyard, vending machines etc... I've always stayed there or in off-base hotels. I've heard horror stories about some of the other rooms. If you end up in off-base housing you definitely need a car. The shuttle service to and from the off-base hotels is lousy. They're about 4-5 miles from FLETC. The shuttle service on-base is pretty good.
There's not much to do out there. Jeckly Island and St. Simon's Island are ok trips...not much going on there though. Savannah is worth the trip - as well as Jacksonville, FLA.
When are you going? I've been there in August before...needless to say - it's HOT. Bring a good pair of Oakleys and UnderArmor Heat gear. If you carry a piece down there you have to check it in the main building when you first arrive. They have a strict 'no weapons' on base policy - 'cept the red guns the students carry and the weapons they issue you at the range.
Anyway....FLETC really is what you make of it. I've made a lot of friends down there - both students and instructors. It's a great place for networking and to make contacts. (Note: instructors are expressly prohibited from socializing with basic students - e.g. if they see a student in a bar off-campus / off-duty - they have to leave). Anyway, send me a PM if you would like more information.