If you want the premier of hiking trails
Maine, hike the trail up
Mount Katahdin (elev. 5,267 feet), a difficult climb of 4,000 feet. The mountain marks the terminus of the
Appalachian Trail, and the beginning of the International Appalachian Trail that runs into
Canada. It's a beautiful location in the wilds of
Maine, a great spot for spying wildlife as well as exploring
Maine's beautiful pine woods.
You'll have to pay to enter
Baxter State Park, where the trailhead lies, unless you live in
Maine. The park is in the Millinocket area, and offers many other hiking trails if you're not into the difficulty of reaching the top of
Maine's highest peak. Try the hikes to Chimney Pond or Fowler Brook if you're looking for less strenuous trails.