Anacostia River Trail! It's great for visiting Bladensburg Waterfront Park (also the cheapest kayak rentals around DC), Kenilworth Aquatic Garden, Anacostia Park, RFK, Navy Yard, all the way down to Nats Park and the Wharf. Most of it is separate from the road, safe, and very easy to follow.
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One fantastic thing about Acadia is the free shuttle that runs through the park. It really opens up your hiking options since you don't have to do loop hikes or out-and-back. Definitely take a look at the schedule/stops and try to coordinate with your hikes. If it's open when you are there (and you aren't too afraid of heights), you should try hiking the Precipice Trail. It is only open certain times due to peregrine falcon nesting, so if you're able to do it it's a treat. If it's closed, the Beehive is a similar hike that's fun to do with good views. Hiking around/above Jordan Pond is also a highlight. Cadillac Mountain at sunrise, whether you drive to the top or get up early and try to hike up before the sun hits (we did it this way, very fun) is also beautiful. ALSO: bring some kind of container with you to collect wild blueberries! We found a lot of them at the South end of Bubble Pond. If you want a different, less busy experience than most park visitors get, head to the Schoodic Peninsula section of the park. It's separate from Mount Desert Island and gets a lot fewer visitors but still has a lot to see. Don't forget to make time to walk around Bar Harbor itself. Lots of great ice cream shops, seafood, etc., and the shuttle stops there too.
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