I totally recommend all of Disney's Segway tours. I have done the Epcot tour 4 times now, and its been a little different each time. First time with the old Segway H2's, the other three times with the newer i2's. Depending on the guides you get seems to determine what information you get told as you go around the World Showcase, always interesting. And this year we had lots of time left so we went back the way we came through all of the countries.
I also took the Wilderness Back Trail Adventure for the first time last week, so much fun, the X2 segways (with chunky tires) are great. The training time was less, more time riding, I would guess that that was because you encounter far fewer people than over at Epcot.
The Cruzin' Disney's California Adventure park tour out in California is also worth doing, this one comes with breakfast and is all before the park opens to guests.
I'm clearly a Segway fan!, shame we can't use them here in the UK, well only on private land.