First, let me just say in advance, Welcome to The Park! you are coming to Glacier National Park at the perfect time. This will ensure that the Going to the Sun Road is clear of snow and you are able to drive to and over Logan Pass. Make sure to stop at Lake McDonald and go to the boat access. Also, go to the Lake McDonald Lodge. It is full of history and a very cool place. Next on the way up Going to the Sun Road stop and do the Avalanche Lake hike. It's a short hike and definitely worth your time. Next, enjoy the whole drive up the Going to the Sun road and don't be afraid to pull over, just make sure it's in the designated pullout spots.
Once you get to the top of Logan Pass Park and do the Hidden Lake hike. This is a beautiful hike and a great spot to stretch your legs. If you are looking into more difficult hikes I would recommend the Reynolds Mountain hike, Dragon's Tail Ridge hike, or the Mt. Oberlin hike. Instructions and directions for these hikes and much more can be found at, The Outbound Collective. Always make sure that you have Bear Spray with you. Each of you should have a can of it. When I am out looking at Montana hunting ranches for sale, I always make sure to have a bottle on me. You never know when you might encounter a bear. I always say it's better to have it and not need it than to need it and not have it. The best thing is to be prepared and have a full understanding of how to use your Bear Spray effectively.
There are more places to stay on the West side of the park, but there are also good campgrounds on the East side. For the West Side, The Izaak Walton Inn is always a good choice. For the East Side, I've heard good things about the Granite Peak Chalet and have stayed at the Two Medicine Campground. For most of my visits, I have stayed in West Glacier so I'm not of much help on the East side.
When you do make it to the East Side of the Park, make sure you do the Oldman Lake Hike. This hike is beautiful and can either be done in one or two days. Also, make sure you visit Swiftcurrent Lake and St. Mary Lake. These are two of the most iconic lakes in Glacier National Park beside Lake McDonanld.
From East Glacier, it would be best to head into Canada. Unfortunately, I cannot be of much help as to what should be done on the Canada side. Hopefully, someone can elaborate on this aspect further on in the comments.
You could spend an entire summer in the park and never do the same thing twice so you'll have to be selective, but no matter what you choose it will be a good decision. Have a fantastic and safe trip!
