The Gould Trail on Mount Greylock, in Adams Massachusetts is a 3.2 mile out-and-back trail that leads up to the summit of Mount Greylock, a backpacking shelter, and two large waterfalls. Mount Greylock is the highest point in Massachusetts at 3,489 feet with an expansive 5-state view at the top and the Gould Trail runs the entire way up. The total length of the Gould Trail is closer to 5 or 6 miles out and back to the summit of Greylock; however, this GPS data only brings you to the shelter and waterfalls about half way up the mountain.
Around mile 1.5 you'll find a left-hand turn which leads to a large backpacking shelter that sits between two large waterfalls. The waterfalls cascade down about 50 to 60 feet to a creek below. One of the cascades sits at ground level with the shelter and the other is slightly taller by about 20 or 30 feet. The waterfalls are best seen in the Spring when the snow is melting off the mountain.
The shelter is about 1.6 miles from the parking lot, hence 3.2 miles total. The top of Mount Greylock is about another 1 or 1.5 miles from the shelter. The round trip to the summit is closer to about 5 or 6 miles.