As others have noted, if you are on-property:
Disney Springs
Resort Hopping via the monorail & Boats (again, enjoy the ride)
Resort Hopping via the Skyway (same as above)
There are so many walking trails
Hotel Pool
Disney resorts often have other “hour long” type things. Making Tie-Die shirts for example
If you can go off property (you have a car, or are willing to do ride share)
Other major and minor theme parks in Orlando Area
Outlets (especially the Disney Character Warehouse)
There are even some dinner shows (look for groupons)
Boat rides (We did Boggy Creek Airboat a year ago, I think it was an hour ride, and included lunch when you returned)
A million “Tourist” things on International Drive
Along those same lines, sometime you just want to catch a meal outside of the Disney Bubble, for environment or economic reasons.