Our group went here to cool off during a heat wave. The kids wanted something different from going to Newfound Lake every day. After a short walk thru the woods there is an area with a swimming hole and a waterfall. The water is A bit cool but oh so refreshing and clean.
There is a bit of Rock climbing to get into the hole so I would recommend water shoes or sneakers.
Our kids did cliff jump under the advisement of one of the experienced locals that was there but I wouldn’t recommend it as that area is not that deep and the safe zone to jump in to is not big.

Touring New Hampshire, we tried to revisit a lot of covered bridges, waterfalls, and other sights. We visited in June and when we stopped in at Profile Falls, we did not see another person. But mosquitoes were there in great abundance. Bring repellant and wear long sleeves. To find Profile Falls take Smith River Road to Profile Falls Road then take the one lane unpaved road to the fork in the road--take the very hard right. We did not hike the short distance to the falls due to the mosquitoes. There are trailheads for hiking, a lake for swimming and out houses. There is a web site you can search under Profile falls Bristol NH.