Hi floridagirrl2 -
There are SO many non-park things to do in WDW. Our friends/family can't understand how we don't get bored going every year, but we always find something that we just didn't have time for. Of course, it's a great excuse to go back again!
There are the obvious choices like DTD, Cirque du Soleil, Boardwalk, etc, but there are also lots of less well-known activities, especially at the resorts. The carriage rides at Fort Wilderness are very romantic and reasonably priced, but they're also fun with a small group. I understand they have carriages at Port Orleans as well, but we haven't done those. There is also horseback riding at Fort Wilderness, a decent trail ride through pretty scenic areas.
If you're more adventurous/athletic, there is parasailing at the Contemporary. We did a tandem, but there are solo flights as well. We thought it was a little pricey for the short time in the air, but it was pretty cool.
There are also things to do in the parks that aren't typical
"park-y" activities. A lot of the tours are great options for couples/solos, and a neat way to meet other adult travelers since many of the tours are open to age 16 and up only. We did the Segway tour in March and have also done Backstage Magic & Keys to the Kingdom, both excellent. I'm hoping to do Gardens of the World at Epcot in May while DH is golfing.
Did you know there are tours at WL? They have 2, I think, one a general tour and the other oriented towards the food and restaurants at the lodge.
Of course, our favorite activity is people-watching, 'cuz that's where you see some of the best magic happening!