Flathead Lake Best all-day adventure You can’t talk about lakes in Montana without first discussing Flathead Lake. My all-time favorite day trek is a paddle to Wild Horse Island, a unit of Flathead Lake State Park. The southern half of Flathead Lake is within the boundary of the Confederated Salish and Kootenai Tribes Flathead Reservation. Whitefish Lake Best for beginners A quick 40-minute drive north will bring you to Flathead’s little sister, Whitefish Lake. Earthquake or Quake Lake Best for history buffs If you’re a history buff like me, don’t skip out on Earthquake Lake.