Folksy, local musicals are put on usually 2 a night during the summer and early fall. The outdoor stage is inside the huge Peninsula State Park, complete with pine trees growing thru the stage floor. The stories have a local or northern Midwest flavor. I've seen 3, liked "Cheeseheads-The Musical" the best so far.
Try to see one with Doc Heide in it, he's a great, funny actor.
My favorite trails in Door County are in this park--there's a small fee for a parking pass, but otherwise it's free. Wonderful rock formations and cliffs along the lake.
Ellison Bluff County Park, Door County
Another beautiful park with trails, and this great lookout boardwalk jutting over a cliff sliding into Lake Michigan. A great view on a sunny day like this!