We stayed in early August for 2 nights in the Sleeping Waters campground.
We got there pretty late (after dark) for setting up camp, and I do not recommend doing that. It's about a quarter of a mile walk to the campsite, but the site is absolutely gorgeous! Very secluded and very roomy! The waterfall at the campsite is not large, but it still makes noise.
After we got everything set up and got all the lights out, we noticed the glowing dismalites along the Canyon wall behind our tent!! It was super cool. We also had a creek flowing with crawdads, minnows, and bull frogs. Plenty of wildlife!!
The canyon was pretty cool! The waterfalls were awesome and I loved all the spur trails. Disclaimer: be prepared to get your feet wet!!
The Canyon and campsite were pet friendly. Dogs were even welcome in the country store!! Just not in the seating area for the Soda Fountain.
I have few, minor complaints.. 1) I booked this campsite earlier in the year (early spring, I believe). I specifically wanted a night tour. They did not tell me that they wouldn't have night tours at that time of year. I wish I would've known, as I would've planned the trip for spring or fall. 2) the gate to get into the Canyon after hours for the bath house was difficult to operate. I'd pinch the code in and it wouldn't open. It would take several tries. The gate for the campsite area worked great! 3) The gate leading to the campsites was not marked. At night, it was challenging to determine where to park. 4) In the Canyon itself, not all of the landmarks were marked!! We had a map, but we had never been there before, so we weren't able to find everything easily.