Orlando is chock full of theme parks - Walt Disney World, SeaWorld, Universal Orlando - but don't try to see them with kids in one go. If you're visiting for a weekend, pick one theme park. All the parks have imaginative play areas for little kids.
Tip: Orlando is quite spread out, and you’ll want a car to get around, unless your hotel is in the theme park you’re planning to visit.
Disney World has a constantly changing system of ticketing and park reservations, time slots for rides, dining reservations, etc. We can't keep up, so check out all the latest information with link above.