Skagway and rent a Jeep from DIY Jeep tours. Get there right at 8:00 AM when they open (you can walk to the office from the ship, about 2 blocks). Follow the map provided in the Jeep and drive all the way to Emerald Lake. Bring your passports because you enter Canada and have to stop at a customs office. There's only one road that takes you straight there so it's very easy. The scenery is breathtaking. Don't make any stops on the way up, drive straight to the Iditarod Musher Camp and hold the puppies before the tour buses arrive. Then continue to Emerald Lake, and eat lunch in nearby Carcross at The Bistro and check out the town. Then, drive back to Skagway, making lots of stops for scenery and pictures. Watch for wildlife along the road, we saw a bear, beaver, and mountain goats. This is much cheaper than the train ride and better for kids in my opinion. I have read lots of reports of kids getting bored and falling asleep on the train.