Universal parks.
Universal own two parks themselves: Universal studios and Islands of Adventrue. They are right next to each other just north of International drive.
Universal studios has rides and shows based around movies like Jaws, Simpsons, Earthquake, Men in Black and so on. Great park
Islands of Adventure is a HUGE park based around white knuckle rides and family shows. Also a great park.
They also have a deal with some "partner" parks so a Universal ticket gets you into those parks as well
The partners parks are:
Wet and Wild. A water park fairly near their other two parks
Sea World. A combination of zoo and theme park with water and sea based shows, and some theme park rides.
I should say that sea world was my favorite park, and the Shamu the killer whale show is AMAZING.
You can buy a single week ticket that gets you into all 4 of these parks as often as you like
You can also buy a week ticket that gets you into these 4 parks PLUS Busch gardens if you want to go there.
I my opinion you could EASILY spend a week in these parks and never need to go to a Disney park.
More on the tickets here
http://www.universalorlando.com/tickets/orland o-flexticket.html