After you park at Disney Springs, consider taking a bus to a monorail resort, ride the monorail to see Grand Floridian and Contemporary, have lunch, and then take the bus back to Disney Springs. This takes a half day, easily. If the weather's really good and warm enough, add a boat ride from the MK dock to Wilderness Lodge or Fort Wilderness - which has a playground near the beach.
If your child(ren) would be frustrated at seeing the crowds of people going into MK (but your family not going inside), then skip that route on this visit. The views of Epcot/HS park gates are more distant and less kid-enticing from the Skyliner stations than the views of MK from the monorail. So...
Alternately, from Disney Springs, you could take a bus to one of the Epcot resorts, walk around Crescent Lake, get lunch and an ice cream or bakery treat, ride Skyliner to Caribbean Beach Resort (from either Epcot's International Gateway or HS), and then take a bus back to Disney Springs. Again, if the weather's great, include a ride on a Friendship boat between a couple of the Epcot resort stops. If you love the Skyliner, take it all the way out to Art of Animation - there may be a playground there too.