We do it all the time. We are DVC members and stay at the BW,BLT & BC. IF you are staying at a deluxe there is so much to do. We have rented bikes, boats ( I loved boating around the MK resorts, watching the paddle boat cross and being outside the MK-- seeing it from a different view), made Mickey tie-die t-shirts, resort hop to see all the Christmas decorations, watch movies on the beach at the Bc and always watch Illuminations from the bw bridge near Epcot. We will usually do a nice dinner show or character dinner.
Its just so nice to take in the atmosphere at each resort. We stayed at the Akl one night and spent the day at the pool, participated in the nightly parade in the lobby, had the kids charactures (sp)done as their favorite animals, did the night viewing and story telling around the fire and ate at Boma. Things we would have never done if we spent the day at the park and those activities created a different set of memories.
If you get bored you can always go to DTD or play Mini golf or even pool hop.