The largest natural freshwater lake west of the Mississippi, Flathead Lake sits about 8 miles south of Kalispell and is essentially impossible to ignore on a clear day. The drive around its shores (US-93 on the west, Montana 35 on the east) takes a couple of hours and covers very different terrain: the west shore is relatively undeveloped, while the east shore has cherry orchards, small towns, and views back across the water to the Mission Mountains.
The town of Bigfork, at the north end of the east shore, is a pleasant stop with galleries, a summer theater, and good restaurants. Polson, at the south end, has boat rentals and access to the Flathead River.