Have been to Alaska twice before and always heard from other passengers that the Dog Sled on the Glacier is absolutely the best experience they have ever had. Unfortunately, it's always been too pricey for the four of us - so this year we've opted for the Dog Sled Camp in Skagway since it fit in with our schedule better and it's a lot less expensive. I hear that the Dog School and the Museum at Carlock is really good as well. Probably doesn't help you that much but it's the best I can offer.
12Cats