We did the Real Alaska package which included visiting the "facility", getting educated on the dogs, loving on some puppies and going on a ~2 mile wheeled sled ride. Resurrection Mountain and Box Canyon Creek sound familiar. We then took a bus (part of that package) up to Exit Glacier for a short hike in to the glacier. That package also includes lunch at the Resurrection Roadhouse at the Seward Windsong. All told, 5-6 hours. I'd check with them (Seaveys Ididaride) and see if there's a specific package that draws your interest. They do also offer a helo in to a glacier and dog sled ride package but it's a lot spendier.

We were there late June with no snow, so my guess would be probably not. However, they use covered wagons in the summer so you get the same sort of experience - watching the dogs at work, enjoying the scenery - just no snow. You also get a chance to talk to mushers (some of whom have raced the Iditarod themselves), interact with the dogs, and (if available) hold puppies. The dogs are treated so well, and it’s fun to watch them get excited about working. They jump around and vie for spots on the line. We were told that, like any athlete, the dogs train all year, so while there is no snow it is just an off-season workout for them. I hope you go - it was a great experience!