Rent boats at the Apgar [1] dock. Canoes and rowboats are $14 per hour, motorboats are $22. There’s fishing tackle for rent at the boat dock, but the savvy angler won’t bother with the few planted cutthroat or the lake trout that migrated over to Lake McDonald [2] from Flathead Lake [3].
Links:
[1] http://www.moon.com/destinations/montana/glacier-national-park/lake-mcdonald-valley/sights/apgar
[2] http://www.moon.com/destinations/montana/glacier-national-park/lake-mcdonald-valley/sights/lake-mcdonald
[3] http://www.moon.com/destinations/montana/missoula-and-northwestern-montana/flathead-lake