We always just take the (non-reservation) horse-drawn Wagon Ride that loads up in front of Pioneer Hall every night.
Very low price, and a lot of fun.
http://www.allearsnet.com/btp/carriage.htm
This also is often another way to see the Electrical Water Pageant on Bay Lake.
We do this every time we go to the 7:15 Hoop:
It's just like a horse-drawn "hay-ride" (no actual HAY is used, but a wooden wagon with benches all around, drawn by two horses) that departs from in front of Pioneer Hall (the Hoop's theater) at about 9:30. The driver heads the horses down to a secluded section of beach and stops so the riders can view the EWP in private. It's really kind of special.