Koby and I highly recommend checking out Glacier, it is our favorite place ever and you will be so close!
One thing to note if you are going to visit Glacier; you need a National Park pass and a vehicle reservation for Going to the Sun road, Many Glacier and North Fork. Reservations are available 4months in advance to the date (August 23 will become available April 23rd at 8am MST, set your calendars!!).
Website: https://www.nps.gov/glac/index.htm
Phone Number: 406-899-7800
Avalanche Lake: 5 miles round trip, rated moderate. Follows a beautiful creek through the woods and then opens up to a gorgeous lake at the end.
Apgar Fire Tower Lookout: 7 miles round trip, rated hard, up hill climb with a great view of Lake McDonald.
Hidden Lake Overlook: 3 miles round trip, rated easy. Beautiful views the entire time!
St. Mary & Virginia Falls: 3 miles round trip, rated easy. Two beautiful waterfalls!