Another vote for Orlando. Check out some of the deals on Travelzoo:
http://hotels.travelzoo.com/orlando-hotels/We go to Florida often, as a kid my favorite memories are from Orlando. And yes, most of this includes Disney and Univ Studios.
There are tons of other things to do like JoP mentioned:
Trip Advsior, but also take the fam to Universal for a day. You can\'t do anything Disney in a day without the kids wanting more.
Panama City & Destin are great if you want a low-key beach stay (and to save money!). It\'s not as built up like all the other beaches. Think OBX vs. Ocean City MD. Tradeoff is it can get boring after 3 or so days. If you want this trip to be memorable spend extra and get a beachview hotel. Nothing like keeping your window open and waking up to the sound of the waves.
Miami/Hollywood/Ft. Lauderdale can still be enjoyable with a family but keep in mind these cities are geared more towards the 21+ crowd. Expect to see a ton of restaurants pushing mimosa deals. That said the family will enjoy the boardwalk at Miami, and the beach/beachfront in Ft. Lauderdale. There\'s also
Las Olas Blvd which is great to walk down, the wifey will love that. At the northern-most point you can check out the little waterfront and take a
ferry that will go along the intercoastal waterway and point out all of the billionaire\'s homes. Very scenic. Also recommend the Vizcaya Gardens if you like white people stuff:
http://www.tripadvisor.com/Attractions-g34438-Activities-Miami_Florida.htmlCali is a lot of fun as well, but I generally prefer Florida for more touristy-type stuff.