Orlando: Honestly, besides the parks there is pretty much nothing.
Tampa was a great time though. Make sure you go to Hattrick's:
http://www.hattrickstavern.com/
The owner was great to us and fed us round after round of free shots. This place is in walking distance of the Arena, so very easy to check it out before/after.
There is also a plaza area in front of the rink where there were lots of pre-game festivities.
If you're interested in nightlife, Ybor city is a good time from what I barely remember.