Segway's are very KEWL if you have a little balance. If you are clumsy...you may have an issue.
THIS. I had a great time, as did my girlfriend on the Segway tour. She did manage to run herself over and scrape up her knee though :lol: In the end it was all fun! In all seriousness though, they are quite easy to ride and a great way to experience the park, and a new method of getting around if you haven't ridden a Segway before.
In terms of Backstage Magic, we had a great experience, I'd definitely recommend it if you have interest in the behind the scenes magic that makes Walt Disney World what it is. Contrary to popular belief, I didn't find that taking the tour makes the parks any less magical, if anything it made them more fascinating to me.
I also had the opportunity to do the Wild Africa Trek in February last year, and it was very much worth the cost. You get up close and personal to hippos and get to cross a rope bridge over crocodiles which was neat! If you or someone in your party is squeamish over food though, I'd recommend eating up prior to the tour. The food is quite "exotic", though very good. You will need to ensure that anything you bring can be securely fastened to your person. There are lockers, which I seem to recall were free, prior to the trek. In practice this meant ensuring you have neck straps for your camera equipment. In order to prevent you from needing to carry a water bottle Disney provides a stainless steel water bottle with carabiner to help you keep hydrated over the trek.
This trek also includes a coupon code for a free photo cd. It will also work to get any other photo pass photos burned to this CD for free and mailed to you after your vacation.
My next vacation I plan on doing Behind the Seeds as I really enjoyed seeing the technology Disney and the Department of Agriculture demonstrate in The Land.
I'm sure whichever tour you take you will enjoy greatly! Have a good trip!