I've toured the UP in June and the bugs are - indeed - thick.
Long clothing is the best insect repellent.
Long sleeves, long pants, a hat with a neck flap or a bandana you tuck into your collar.
Cutters makes a stick repellent that is like stick deodorant - hard to find - 33% Deet.
I prefer to put it onto my cuffs and collar and cap visor rather than directly on my skin.
Pick campsites where you can spend most of your time with the wind coming off the lake.
(But keep your tent 100 yds back)
Best - J
PS - I wear light glove liners if necessary. Watch you ankles. Those boogers really know how to find vulnerable spots. They can and will bite thru clothing, as well, especially your shoulder blades. An extra bandana used as a whisk helps here.