Yeah, there's not much worth doing in the immediate Orlando area that's not connected to the parks or at least their attendant resorts. Downtown Disney is a good suggestion. I'm not a big Islands of Adventure fan personally--it just seems like a Six Flags to me. If you want something a little more laidback and adult at one of the parks, my friends and I used to go on an "Around the World" tour at Epcot, where we'd stop and have an adult beverage at each nation in the World Showcase. It's pricey though: we had season resident passes, so that was cheaper for us, but the drinks/food are not cheap there. Just slightly further afield, you're surprisingly close to the beach, and Cape Canaveral is right there, too--highly recommended. I used to go clubbing at the Firestone in downtown Orlando a lot in the 90s; great place but I'd imagine it's gone now.