Hey Rush,
Pending Paul getting back to you on this, quite a few guys got into standup using old windsurfing longboards. They may not be all that spritely in surf but for cruising as long as you have enough displacement and glide surface you should be good to go. I have seen a guy with an F2 Phoenix, I think, doing standup off Delray at times. Grab any old paddle and give it a go. If you like the way it handles you can invest in a proper standup carbon or carbon/aluminum paddle and perhaps even a polyester purpose fabricated standup board.
Way to go the guys at Eckerd. You have vast surfing areas open to you there and some nice swells to play with too at times. Have fun and let us know how it is going.