Orlando, if you aren't going to stray, means lake and spring diving. You can also dive Disney's aquarium and the Seas in Epcot.
We did our training and check out for OW in the area. We found the springs to be generally not that interesting. They were great for practice because no current, lack of distractions, and so on. If you are so certified, many also offer cave diving. But they aren't really our style for recreation. They are a constant 72F or so, which can feel great on a hot August day.
Lakes, on the other hand, are interesting to me and I'd like to do more of it. The wife is not so keen on it, but I think they'd be a great place to practice navigation, low viz diving, and for bottom exploring. My only concern is the boaters, and Aug is a prime boating time. So you'd want to find a place that's known for safe diving.
I have seen a number of threads about Disney's Seas. We swam it once before certification and had a great time. Don't know if I'd do it now as a diver, but I haven't seen a bad review of it, honestly.
Dayo Scuba is a good resource for local diving news, info, and trips.
Best of luck