My family and their friends and their family used to go to Door County, Wisconsin every year. We always had a great time! Lots of state parks and places to hike/ride bikes. Lots of golfing too! Oh, and we always spend one day on a pontoon boat that we rent on Green Bay!
Love love love Door County! It's a staple summer vacation spot for my family, too.
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"...we realized somehow that we weren't going to college just for ourselves, but for all of the girls who would follow after us..." Bettie Locke