Grand Marais, Minnesota
Alright, so you're probably not gonna be doing much swimming in the generally frigid waters of Lake Superior, even if it is August -- but if all you wanted to do was swim, you'd be at the beach. There's more to a lake town than showing off your scissor kick, and Grand Marais offers the full outdoorsy spectrum of canoeing, hiking, fishing, camping, rock climbing, and even birdwatching (for voyeurs who like to spy on birds).
On top of the active stuff you'd expect from a vacation spot on the lake, though, there are also some solid dining (like Sven & Ole's Pizza and World's Best Donuts), and the town's actually got a pretty vibrant arts scene too. No trip to Grand Marais is complete without taking a walk down to the lighthouse at Artists Point, a small peninsula perfect for snapping the kind of Sutro-filtered Instagrams that'll get you hidden from your friends' feeds.