Our Alaskan cruise was in October and the rail was running. If you or your partner are at all into nature hikes, I highly recommend the rail excursion with hike. The train stops midway up the mountain and you get off and head for a trail in the woods that will eventually lead to a glacier.
The only awkward thing about this excursion is that the train will drop you off at 0900ish and come and pick you back up, either at 1100hrs or 1600hrs. The 1100 pick-up time is nowhere near long enough to get through the woods to see the glacier, and the 1600 pickup time was so much later that we turned around and went back. So pack food, pack some toilet paper, pack some water, and go for it. The scenery on this hike (even if you only do the 1100 pickup) is absolutely unmatched. I have pictures on my phone that I took myself which could be in national geographic..