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If you're looking for something fun to do at Walt Disney World that doesn't cost a dime, try riding the Water Taxi from Downtown Disney to Port Orleans - Riverside and back. You'll get some great views of Downtown Disney - Westside, Saratoga Springs Resort, beautiful flora and fauna of central Florida, bridges, other boats, Port Orleans - French Quarter, and Port Orleans - Riverside from a unique, marine perspective.
If you don't mind spending a few bucks when you get to Port Orleans - Riverside, you can rent a surrey bicycle or ride in a carriage around the resort, grab some dinner, or shop for souvenirs before returning to Downtown Disney on the Water Taxi.
The video below shows one of our rides on the taxi with views along the way. The video can get a little long, so feel free to skip around to see the whole trip. It's a fun little adventure for the whole family.