Disney has many fun activities outside of the major parks:

Many Disney resorts offer boat rentals and bike rentals.  There are all different sizes of boat crafts and include motorized craft, paddle boats and sail boats.  There are all different types of bikes also and even a large four-wheeled surrey bike for the whole family to enjoy together.  These are a great way to tour the beautifully landscaped and relaxing grounds of some of the resorts.  Port Orleans Riverside or French Quarter also has carriage rides. You can also get in some catch & release fishing or horseback riding or even a campfire sing-a-long. Check out these other resorts for options: Wilderness Lodge & Campgrounds, Caribbean Beach, Grand Floridian, Polynesian, Yacht Club.

If you want to window shop, grab a bite to eat and people watch then both the Boardwalk and Downtown Disney are great areas.    The Boardwalk is easily accessible by foot from Epcot, if you have a hopper pass then get the bus to Epcot and leave through the World Showcase entrance between the UK and France.  From this Epoct entrance there is also a free boat that runs to and from MGM studios. If staying on property remember that buses to downtown Disney only run from the resorts and not from the parks.

If you have time to kill and want a relaxing day, then resort hop and tour the grounds at each.  All of the Disney resorts are fun to see and can easily fill an entire day with "free" fun.  You can obviously get to all of them on a bus, but grab a transportation map and use the monorail and boat systems for added fun.  Did you know that you can even ask to ride in the very front of the monorail for a perfect view?  Another great "free" thing to do is head over the the Animal Kingdom Lodge for an up-close view of some amazing wildlife.  The grounds are fantastic and you can see the zebras, giraffes, flamingos and many other creatures. 

Some people don't know that Disney also has two great mini-golf courses Fantasia Gardens and Winter-Summerland.  Fantasia gardens is located near the Swan and Dolphin hotels.  Winter Summerland is ideally locate next door to Blizzard Beach.  Winter Summerland offers two courses, a summer and a winter, both celebrating Christmas.  Like all things Disney the golf has a story behind it and like Blizzard Beach the story goes that Santa and his elves decided to move to Florida, some stay in the snowy area created by the freak snow storm that hit the area and others prefer the Florida heat.  The courses are wonderfully themed and great for a short break from the parks