We started from the lower falls campground, site 145. If you go to the bottom of that loop, there is a small loop trail that takes you down to lower falls. We took the the branch going east to start, and it's about .7 miles of really nice pine forrest trail. After exploring the lower falls, we took the .3 mile board walk around the north of the falls and to the start of the official "4 mile trail" to upper falls.

Depending on how often and where you've hiked before, you'll have different feelings on this trail. For me, it was average scenery, mostly through woods but occasionally along the river. The trail is very rooty and has a couple of hills at the start of the 4 mile trail and near the end. Nothing too difficult. I'm sure it's due to time of year (mid July), but several sections of this trail are very overgrown with weeds. The trail is always easy to see, but you'll be fighting overgrowth for about 15% of the trail.

At upper falls you will have to negotiate a bunch of stairs to see the falls. Make sure you go to the end of the boardwalk for best view.

After we were done, we turned around and hiked back. Once we got to lower falls, we got in the water, which was surprisingly warm, then headed back on the shorter "western" leg of the loop up to lower falls campsite. There are nice markers at the intersections with picture of the trail map so you'll know what I mean when you see it.

For this loop I had it measured via Garmin at 9.7 miles. If you walk all the way up upper falls park to the actual falls, I could see it being 10+.