You should have a blast. I'd try and get a few different flies to cover the water column from top to bottom, and to have a couple of things for Large Mouth Bass and panfish. You probably already know this, but the Santa Fe also has a population of the Suwannee Bass and it would be really cool to catch one of those. If you are lucky enough to get one, hopefully you can get a pic and post it here on the board. Here's a little info about them: http://myfwc.com/WildlifeHabitats/Fr...wanneeBass.htm
The flies you already have would be good to bring, and might get you some bluegills and other panfish but you'll also want to get a few others especially meatier patterns for bass. I'd think about getting some stuff like:
-a couple poppers (small size 10 or 12 for panfish, and some bigger ones for bass size 6) would be fun for top water.
-some bead head black woolly buggers size 6 or 8 and chartreuse clousers are some popular and effective flies for bass pretty much everywhere and would be good to have. They should also be pretty easy to find.
But the Suwanee and Santa Fe are heavily stained with tannin in many areas, so some flies that are very visible and push a lot of water like spun deer hair or synthetic baitfish imitations in "fire tiger colors" might be good to have.
Crayfish make up a big part of the bass diet in the Suwanee/Santa Fe system so weighted crayfish imitations would be good. These can be elaborate patterns with claws etc if you can find them, but simpler stuff like brown or olive woolly buggers, or brown over orange clousers would probably also work well.
Good luck--- looking forward to a trip report!