This is one of the best hikes in the area. 11-12 mile (18-20km) when you start on the gill Brook trail, hike up to indian head overlook, walk down to the dam, cross the bridge to see rainbow falls, take that trail to the West river trail & then make your way to Lake Road til you get back to the car park.
It can be done in 4-5 hours with a 30 min break at the overlook. I would recommend to spend extra 40-50 minutes to see Rainbow falls. Views from the top are amazing. Some people didn’t like the fact that you have to walk through a private property ( golf course) but it wasn’t too bad. Trail itself is nice and filled with beautiful rivers, waterfalls , plants etc. wear good hiking shoes as the trail can get muddy and slippery.
I would go back again.
Don’t forget you have to make a reservation from may 1st to October 31st.