Was on Ovation in September and had a great time. You have got all the major sights. Walk through the Sitka National Historical Park and cross the road to the Raptor Center. Very easily walkable from the bus drop off point near downtown Sitka. There is/was a reindeer hot dog station near the bus stop too. White Pass Scenic railway definitely a great excursion. In Juneau, there is also the Mount Roberts Tramway - if it is a clear day, you will get great scenic views. You may have to allow a bit more time if you want to hike the easy trail to the falls, closest to the Mendenhall Glacier. Consider too Tracy's Crab Shack in Juneau, although they did not have any king crab in September (not sure if any still now).