There are lots of things to do in Disney without ever entering the parks! In fact, you are dining in a beautiful resort, so one option would be to spend the evening exploring the Wilderness Lodge, and then stroll down to the beach to watch the Electrical Water Pageant and Wishes.
If you've seen the Wilderness Lodge before and would like a little more nightlife,
Disney's Boardwalk is also a great destination. Until about 10:30 pm you'll find live performers like jugglers and sword swallowers, as well as midway style games, just like you'd expect in Atlantic City. If you'd like an air-conditioned break, there are bars, nightclubs, and even a dance hall just a short walk away. Or you could walk to the other end of the Boardwalk and watch Epcot's evening show, Illuminations, without ever entering the park.
Very nearby at Ft. Wilderness, Chip and Dale will be hosting a campfire complete with s'mores, which begins around 6:30 pm. You might be able to catch the tail end of the singalong, which is immediately followed by an outdoor movie.
Evenings are a great time to visit the Animal Kingdom Lodge, as the animals are more active. You'll even find cast members outside in the viewing areas, offering binoculars and more information about the wildlife.
If you'd like something a bit more boisterous, perhaps a visit to the Port Orleans-Riverside resort is in order. The River Roost Lounge is home to Yee-ha Bob, a fun and family-friendly singalong leader, piano leader, and jokester extraordinaire. Children are welcome, and non-alcoholic drinks are happily served (as well as the adult variety).
And of course you could always explore the other resorts, Downtown Disney, take a fireworks cruise, ride the monorail to Epcot and back, just for fun, hit your resort pool or arcade, or play a round or two of mini-golf! Even without theme park admission, the opportunities are endless!