The Bash Bish Falls Trail at Bash Bish State Park in Mt Washington, Massachusetts is a moderate 2 mile out-and-back trail that leads downhill to Bash Bish Falls and follows Bash Bish Brook west. Bash Bish Falls is the highest single-drop waterfall in the state and a must-see if you're visiting the Berkshires.
There are two parking lots for this trail. The parking lot to the west, along Route 344 is an easier hike to the falls, but a longer out-and-back hike. If you park at the east lot, above the falls, you'll end up hiking down a set of stairs and then a steeper portion of the trail to get to the falls; however, it's much faster to reach the falls from the eastern lot.
If you plan to just hike to the falls, the out-and-back hike from the eastern lot is only about 0.6 miles, but it's a much more difficult hike considering the 500 foot elevation gain in just 0.3 miles.
Fishing is allowed in the brook along the trail and dogs are allowed as well.