If you've never been to Littleton, New Hampshire, you're in for a treat. In the summer, it is a pleasant little tourist town with a fantastic farmer's market, great little tourist shops, and one of the best bakeries you'll find. Miller's Bakery makes a great place from which to start your trail tour. In addition to great food, it has great views overlooking the river and covered bridge.
To start the trail, you'll want to cross the covered bridge and start on the opposite side of the river as the main town.