Not being near any of the fabulous Florida beaches has not done a thing to hurt the tourist trade of Orlando. This area is so packed with family activities that it would take every vacation for the rest of your life to see them all.
Of course the most famous attraction is the Magic Kingdom, with Disney World at its core. But there are also many other amazing theme parks, as well as golf resorts, and top notch shopping. It's impossible to get bored visiting Orlando with a family, but recently it's become known for quality nightlife as well, so there is something for every one.