I don't often "car-camp" but I will here. It's a good place to stay in order to be close to starting off a day of adventures in the park. This is a large campground so there will be plenty of other people but with the dense forest and small sites it is usually pleasant. You can walk to the amphitheater for ranger talks and then take in sunset on the lake. Tent and Rv sites but no power or sewer hookups, just a dump station
This is a smaller campground on the east end of the GTTS road. Close to St Mary where there are some amenities. In the shoulder season this campground is open to primitive camping.
When you stay at Many Glacier you are situated in the heart of the best hiking and wildlife viewing in the park. Grizzly sightings on the slopes nearby are an almost nightly occurrence. Sometimes the animals wander right through the campground. There are several trailheads that begin at the campground or within walking distance. While it is a popular and busy place (difficult to get a spot) it is still worth braving the crowds.