International Appalachian Trail – A significant portion of this extension to the Appalachian Trail runs through Aroostook County. Hike some...
Aroostook State Park, Presque Isle – full park facilities at the base. Hike up the north peak of Quoggy Jo (shorthand for its Native American name "QuaQuaJo") mountain for a short 2 hour trek, or if you're a little more adventurous, hike the north peak and follow the trail to the south peak and back down.
Haystack Mountain, Castle Hill – Picnic area and trail to the summit - a great first hike. About 1 mile round trip with nearly 360 degree view at the summit.