I've done quite a few of the tours over the years, but only one of the ones you are asking about, Backstage Saffari. And of the two available at AK, it is the better of the two IMHO. But if you want to know how and why Disney built AK the way it did, the second one, Wild by Design is still a very good tour.
I'd have to agree with hooch on the Segway tour at Epcot. Great tour, loads of fun, and no walking! :lol: We loved it so much last year, that we have already scheduled it for this years trip in October.
Other the other Epcot tour I'd recommend highly is the Gardens of the World tour. My wife is an avid gardener, so she loves that tour, but even I enjoyed it. We've done it three times now.
And if you want a comprehensive tour, do the Backstage Magic Tour. Yes it's $200 a person, but you do three parks (MK, EPCOT, and MGM). You get lunch. and it's very in depth behind the sceens stuff at all the workshops like Christmas Decorations, Animotronics, Metal, Wood, Floats, Costumes, Characters, and even the Utilidors. Plus behind a few of the shows and rides. It's an all day tour, so were comfortable shoes, your feet will love you for that.
If you have any questions on any of the other tours, I'd be happy to give my impressions. I've done the following: Backstage Safari, Wild By Design, Around the World on a Segway, Behind the Seeds, Gardens of the World, Hidden Treasures, Undiscovered Future World, BackStage Magic.
And if you're looking for a Dolphin swim, as much as I love Disney, I would sugest you look into Discovery Cove before you decide. It will eat up a whole day, versus the Disney tour, and cost a few $ more, but it will be worth every penny.
have fun!