Acadia National Park: Maine
When your Summer travels take you to the northeast, Acadia National Park offers tons of family-friendly activities. Ranger-narrated boat cruises are a great way to learn about the island's history and marine life, and with 125 miles of hiking trails, there's something for every level of ability and endurance. Sand Beach may be too chilly for swimming (the water temps go up to just 55 degrees), but bring along a sweatshirt, and it's a beautiful spot to picnic and play.
Source: NPS/John Chelko