They do still offer it. Tours may be booked up to one month in advance by calling (714) 781-4400. Here's the info from Disneyland.com
Embark on an extraordinary guided tour of Disney's California Adventure® Park and discover fascinating behind-the-scenes information as you cruise on a Segway® Personal Transporter.
Learn the basics of how to ride a Segway® Personal Transporter an innovative two-wheeled vehicle that is gyroscopically stabilized by the latest digital technology.
Tour Disney's California Adventure® Park before its regular operating hours.
Enjoy complimentary parking at Downtown Disney® District.
Receive an exclusive tour pin.
Take home a complimentary photograph of your adventure.
Tour Length: Approximately three hours
Start Time: 7:30 a.m. daily
Price Info: $99 for all ages
Discounts: Deluxe Annual Passholders, Premium Annual Passholders,
AAA Members, or Disney Visa cardholders receive a 20% discount.
Additional Information
Tours must have a minimum of two Guests to dispatch.
Guests must wear closed-toe shoes. Athletic shoes are highly recommended. Helmets are provided.
All Guests Must Be:
At least 16 years old.
Accompanied by a parent or legal guardian if under 18 years old.
Between 100 and 250 pounds in weight.
Able to maintain lateral side to side balance.
Able to safely step on and off the Segway® Personal Transporter.
Able to comply with all instructions and warnings.
All participants must meet Segway operator requirements for the Segway® Personal Transporter. This tour experience has been designed solely for Disney and does not replace Segway's Operator Training. Additional operator training is suggested before riding in other environments.
Guests must comply with all of the tour guide's instructions failure to do so will result in the cancellation of the Guest's tour experience. Any Guest whose tour is canceled due to failure to follow instructions will not be entitled to a refund.
Theme Park admission is not required to take the tour. Guests without Park admission will be escorted to the Esplanade at the conclusion of the tour.
Tour times and elements are subject to change without notice.