Northern Michigan has some good sized lakes other than the Great Lakes, where the water likely won't be as rough. Torch Lake, Burt Lake, Mullett Lake, etc. Not sure about boat rental places; someone else might have input. A quick search brought up this:
go fast rentals
Mike G.
Liberty is meaningless where the right to utter one's thoughts and opinions has ceased to exist. That, of all rights, is the dread of tyrants. --Frederick Douglass
photo: Yosemite Valley view from Taft Point