Skagway is a tiny town with more jewelry stores per capita than anywhere else on the face of the earth. If you look up, the scenery is breath taking. We chose to take the White Pass Railroad trip up and down. The train just crossed over the Canadian Border and returned. Since we were considered a 'closed container', we did not need our Passports for this trip. All other Railroad trips with alternative ways back down to Skagway do need to take their Passports and must go through customs when re-entering the U.S.
I must say the Railroad trip revealed some of the most stunning scenery I have ever seen. It was incredible.