I have been around off and on here since mid 1990's. Hope those of you making the trip to Gainesville enjoy your stay (if not the game).
If you stay away from the students, you should be treated with class and respect.
Tailgate spots: O'Connell Center Parking lot on the West side of the stadium. Near the Swamp due north of the stadium. The Law School Library a couple blocks west of the stadium and Norman Field east of the stadium are some of the best spots.
For food, if you want to avoid the "chain restaurants":
The Swamp is pretty good for appetizers.
Northwest Grille about 2 miles north of the stadium is fantastic for fresh seafood.
El Toro south of campus is a hole in the wall but has terrific Mexican.
Gator City (the old purple porpoise) and Copper Monkey (both right next to campus on the north side of the stadium) are the best in town for burgers.
Calico Jacks (west of the stadium, towards the mall) has fantastic wings (Caribbean Wings) and oysers.
hope that helps. I hope you enjoy your stay, feel welcomed to our town and leave just slightly disappointed at the outcome of the game, but still feel it was worth the trip!