Don't miss Bahama Breeze. There's one north on I-Drive, but it's probably easier from The Fountains to head to their other location--south to Apopka Vineland, then hang a right at the light, go all the way down (not even 5 minutes).
My boss recommended Charlie's. We've eaten at the Roadhouse (maybe Joes Roadhouse) the last two trips we've taken. Both times food was really good and the homemade rolls are awesome and hot. Not sure if either of these is on I-drive but I know they are close. Theres a Publix grocer behind Roadhouse, that's where we stop for snacks and sodas.