First off, I know a 5-day trip is extremely short and not ideal, but that was all we could do, so please understand that. My girlfriend and I (both mid-20s) will be traveling with her mom, who is in her mid-50s. So we'd obviously like to do some active things, observe the wilds, etc, but not something extremely strenuous that the mom wouldn't be able to handle.
We will be going in late May, arriving in Anchorage on Friday night and leaving on Wednesday late at night, which leaves us 5 full days.
I've read a bit on the basic destinations, but will keep that to myself to not induce any bias and let you guys suggest. Thanks!