Lake cruises on the KwaTaqNuk Princess (406/883-3636, www.kwataqnuk.com [1], mid-June–Sept.) run several times daily during the summer, leaving from the KwaTaqNuk Resort marina. A three-hour tour departs daily at 1:30 p.m. ($23 adult, $21 senior, $13 child, $57 family) and makes a loop around Wild Horse Island [2]. Ninety-minute cruises depart at 10:30 a.m. and 7:30 p.m. ($17 adult, $15 senior, $10 child, $40 family).
Links:
[1] http://www.kwataqnuk.com
[2] http://www.moon.com/destinations/montana/missoula-and-northwestern-montana/flathead-lake/west-side-flathead-lake/wild-horse-island