We had a similar desire, and this past week we essentially did a no parks trip! So if you’re looking for some days where you don’t even go into the parks, a few things we did were:
Visit the Tri Circle D ranch at Ft. Wilderness
Visit Animal Kingdom Lodge - we spent two afternoons here. The kids did the “string of memories” activities, did crafts in the kids club, watched animals on the Savannah.
We did a scavenger hunt around our resort, many hotels have something like this.
Other hotel activities: s’mores, movies on the lawn, evening pool parties.
Ride the monorail and visit the different hotels.