Bring a beekeepers hat! I'm not kidding, i am going to get a few. I live an hour southwest of the Porkies, (15 minutes from the national forest boundry and was there yesterday) So i cant speak of how the park is up on the big lake but the little black flies were bad here only like a 3 week period but the mosquitos are really bad! Some saying the worst year ever. We took some Il. friends waterfalling and we all were swarmed So the plan is sweatshirts and jeans, thick clothing (so you dont have to bath in chemical repelant) and a beekeepers hat.(or some kind of net hat)
.. you will enjoy your time.