Cannon Beach, Oregon
The frigid water is honestly never swimmer-friendly here, some 80 miles northwest of Portland, but the kids don't care. There's plenty to do on land, including combing for sand dollars at low tide and watching comical puffins nesting in a sea stack just offshore. Try Ecola State Park a mile north of town for a walk among the sitka spruce and hemlock forests to tide pools. After sunset, bonfires break out up and down the Cannon Beach dunes, sites of mellow marshmallow roasts and stargazing sessions.