My favorite I-Drive diversions:
1) Pirate's Cove Adventure Golf. The "natural" beauty of the layout here is much more aesthetically pleasing than the relatively garish and cartoonish miniature golf found inside Disney World.
2) Mercado. Right next to Pirate's Cove. The shopping itself could be better, and mallhounds would probably be better served visiting Downtown Disney or Orlando Premium Outlets, but this place is gorgeous.
3) Wonder Works. Lots of hands-on fun for kids and adults.
4) The Duck March. Every day at 11a and 5p (I think, not 100% sure offhand), the Peabody Orlando's famous ducks march between their private elevator and the fountain in the lobby, escorted by a butler. It's a fun little diversion, and best of all, it's free.