Hey R W B, I've lived in Orlando all my life and there are tons of things to do in the area. If you're coming with family there is the "I Drive" or International Drive area. Its about a mile long stretch of shops and attractions. Some of include a Dave and Busters (arcade), Fun Spot (go carts and carnival feel), Wet and Wild (Water park), and the Universal City Walk (shops, concert venues, movie theater, ect.) There is also a Karaoke Bar called Rising Star where you can sing with a full band. Not really for kids though.
If you are with a family and want to see "The Real Florida" you can shoot up I4 which is the main highway cutting through Orlando to any one of a number of springs. Wekiva Springs is one place you can both swim and rent canoes. Rock Springs is a few miles further and doesn't have canoe rentals. In the summer these places fill up quickly. Usually before noon.
If you're not bringing kids and want to do some "partying" check out the downtown area. The main road is "Orange Ave" and has many bars, clubs, and live music venues with local and national acts performing every weekend.
Also, the beaches are about an hour if not less from the Disney area. Thats both coasts! The West coast (Tampa, St Pete, Clearwater, ect) Is usually clear water, wide white sand beaches, while the East (Daytona, Cocoa) can be like that but has more waves for surfing, boogie boarding and the like. You can also drive on the beach in Daytona.
Ohhh yeah! Also, in St Pete on the West Coast is the Salvador Dali Museum. Its an amazing place and worth a visit. Its about an hour and a half drive from the attractions if traffic permits.
I am sure there are things I am leaving out like Gator Land but that should keep you busy for a while. I hope you enjoy your time here and remember to hydrate and bring sun screen!
Take care.