Three Forks is on the route between Yellowstone National Park and Glacier National Park. Use I-90 (exit 278), US-287, or Montana Highway 2. There is also a small airport called Pogreba Field nearby.
One can view the scenery.
If you're into rodeos, then you are in for a treat. Three Forks is home to the Three Forks Rodeo, and several other horse related events.
One of the local favorite outdoor activities is a trip to Lewis and Clark Caverns State Park. The park offers guided tours with exceptional and friendly staff daily from May 1st to September 30th. They also have camping, rental cabins, and a quaint cafe and gift shop. Be prepared though; the tours are two miles long and take two hours and there are over 600 stairs to navigate.