You have a few choices of resorts that are just a "stones throw" from the parks, depending on which park you think you'll visit most often.
If it is the Magic Kingdom, the
Contemporary, the
Polynesian, and the
Grand Floridian are a short monorail ride to the park.
If it is Epcot, the
Yacht/
Beach Club are within walking distance & a medium boat ride to Disney's Hollywood Studios, too. I do need to note that Epcot is quite large, so to get to the exit can be quite a walk depending on where you are in the park.
If it is the Animal Kingdom, the
Animal Kingdom Lodge is an amazingly short bus ride away to the park, but the bus ride to the 3 other parks (especially the Magic Kingdom) is longer.
All the resorts have kid friendly activities as well as in room childcare available!