Hey EuphoriaII, we did the 18-20 hour drive from OKC to the Florida Panhandle a couple of weeks ago. Great people in that area, and if you need a campsite we liked Sunset King Lake Resort near De Funiak Springs. Nice sites and reasonable prices, close to Vortex Springs and Morrison Springs, and on 331, which we took to get to Panama City and St. Andrews State Rec. Area.
Check in with Flipper at the jetty dive shop and ask about how things are going for the day. My daughter and I snorkeled near the jetty and saw several interesting fish. Wish we had used our wetsuits, though! And remember your dive flag -- it's the law.
http://www.sunsetking.com
http://www.vortexspring.com/default.htm
http://www.tfn.net/Springs/Morrison.htm
http://www.floridaparks.com/stprks/north_west/st_andrews.htm
BTW, Morrison Springs is now free and a state facility. Here is a thread about the trip we did. Good luck and I hope you have as much fun as we did.
http://www.scubaboard.com/showthread.php?p=1023477#post1023477