Did it several years ago and loved it. As others have mentioned there's a lot of standing as well as walking. My favorite part was having HM break down while we were on it - we stopped at the ballroom scene and it was great to be able to sit there and study what all was going on. Plus our guide had spent a lot of time working at HM, so he had good info to share. Going in to the Utilidors was also really interesting. When I went lunch was at Harbor House, but I believe I've read people more recently say it was at Cosmic Rays.