Orlando has second largest hotels room, next only to Vegas... The top destination is Magic Kingdom, Disney. Universal Studios and Island of Adventure are close to City Walk, i.e. you get to same parking lot and then walk to City walk (11AM onwards till 2AM!) or go to the Parks Universal Studios (movie based rides) or Island of Adventure (roller coaster like rides)- the two theme parks. City Walk is couple of miles from Convention Center, but I best bet is to drive or take the shuttle from the hotel. Parking is $12 for cars or $3 after 6 PM (used to be free after 6 but 2009 it changed)
These Universal Theme Parks rival the 4 Disney Theme Parks - Magic Kingdom (great for kids, gentle rides mainly), MGM Hollywood Studios (movie based rides), Epcot (science based rides, good for us Geeks! and world showcase) and Animal Kingdom (more like an upscale zoo!). Then Disney has Downtown Disney, free to visit and Park there... but its not close to the theme parks.
I will keep posting... for tips to Navigate Orlando... been in FL for 14 yrs and been 50+ times to Orlando... well have lost count frankly.