It's called.....the Segway Tour.
REALLY fun! There are multiple ways to get a discount when you book it--DVC, AP,
AAA, Disney Visa will all get you a 20% discount.
It lasts 2 hours--the first hour they teach you how to ride it inside a classroom, the second hour is in WS (as long as it's not raining).
Hope you get a chance to do it...