The hiking as always stunning and the fishing is usually pretty great! Keep in mind September 10th, the vehicle registrations are no longer required so you will be able to come and go from Glacier as you please! https://www.nps.gov/glac/planyourvisit/gtsrticketedentry.htm
Dillon and I have fished here before and have had luck catching medium sized trout & whitefish.
The town of Whitefish is a really cool area to pop into local shops and stop for a hard cider.
This is one of the cooler sporting good stores in Montana. We recommend making the stop!
Have a few days? Rent a kayak and troll for some trout on Lake McDonald!