We spent 2 days at this park, mostly to see the falls and surrounding area (Whitefish Point).  One night would have been sufficient.  The bathrooms were clean, the park was gorgeous;  however, our biggest complaint was the sites were on top of each other.  It felt like tailgating.  Additionally, there was only 1 electric hookup box per 4 campsites, and it was on the wrong side for us (passenger side).  Our electric cable isn't infinitely long, so we had to park the camper far to the left (passenger side), and were more or less in our neighbor's campsite.  BE SURE to look where the electric hookup is located in photos when you choose a site, unless you have a really long plug.  For reference, we stayed at the Lower Falls Campground, Portage Loop, site 60.  Also to note, there was a monsoon of a rainstorm, and quite a few tent campers took on a few inches of water.  The pools were gone 24 hours later, but that didn't help the soaked tent people.

The trails and waterfalls were absolutely amazing, and the gift shop was A+.  I doubt we will go back there, but I'm glad we went for our first UP adventure.