We like to go see the horses at Fort Wilderness, Sometimes there is a blacksmith there. You might get lucky and see a peacock. Don't miss the lawnmower tree if you ride the boats. We also like to go see the historical items at the Wilderness lodge too. There are Native American items in the lobby with descriptions. There is a clue list that the front desk gives of the Hidden Mickeys at the resort.
Wilderness Lodge also gives a free lobby tour in the morning, with Ranger Stan. There's 5 fireplaces throughout the Lodge. I absolutely love the DVC lobby and train room there. Lots of cool history there. They also do a talk about once a week in that room. There's a digital photo frame at the front desk, that gives info on this stuff.
All resorts have a hidden mickey list (or buy the book), and a list of penny press machines.
This is not free but rather on the cheap side. You can rent a bike at the Wilderness lodge and ride along the paved path to the Fort Wilderness camp grounds and spend a good amt of time riding around the camp grounds. A lot of campers decorate there campsites. Stop and see the animals. I think renting a bike all day for two people is around $20. total. Have lunch at the Trails End which I think is cheap if you go for lunch ($12) a person. I might be wrong on this price. I do know 4 years ago when we went it as $9.99 a person but I think it has gone up.
It's still the cheapest buffet on property, and pretty decent. They also have a large pizza for $13, $15 for pepperoni. The regulars are great about decorating for any holiday. I love Halloween and Christmas at the Fort. You can either rent bikes or a golf cart to go looping.
Free films on the outside screen at some resorts too. We stopped by the one at the Contemporary last year.
Most deluxe resorts offer a campfire and movie, which was taken from the Ft Wilderness Campfire program, but they're still the only ones to have Chip and Dale come. They also have an awesome program for Halloween Night.
There's usually a list of pool side activities for the resort. I know at the Wilderness Lodge, they have trivia and give away awesome prizes. But you must be a guest of the resort. I'm sure most the other resorts run it the same way. I was at Beach Club once, and they have one called what's in your beach bag? And ask for random things you might have from Disney. Like a park map, a receipt, 37 cents in change.
Ohh and a bike ride at Port Orleans is fun too, as well as a boat ride to DTD on the Sassagula Boats.