Lake Mcdonald is absolutely gorgeous! Camping along its edges is something you don't want to pass up. This campsite is also super close to all amenities. From June-September this campsite will be super busy. But if you go in the offseason it is wonderful. Just come prepared for winter camping (even in May).
My husband and I often camp there in April, and we will be the only ones there. We take our snowshoes to go exploring the higher elevations.
I'm only giving this area 3 stars because I have never seen anyone camp here before, and I'm not sure you can camp here. It is one of my favorite places to have a picnic though. A quick drive from Missoula. Nice and quiet, despite the frisbee golf course. And if you're into frisbee golf then that is a major plus!