We are doing a similiar thing. We arrive in Skagway at 7a - 8p. We're taking the fastferry to Haines (make reservations for round trip), renting a car and basically "winging it". Full day rental, unlimited miles and tax is about $75. Definately checking out the Bald Eagle Preserve, as well as the hike up to Mt Ripinsky (wonderful view of Haines and the Canal and all of the mountains. And then drive up towards Haines Jct (as far as time will allow us). Scenery is supposedly wonderful. Good Luck!