We camped here mid-May for kayaking on the lake. From the campground there are no designated kayak launches. You can access the water through designated and undesignated paths, but be prepared to portage your yak over either some distance or over a short but steep rocky ledge. If you can, just drive your yaks to the boat dock and put in there.
Bathrooms are spacious and clean. Some campsites are more secluded than others, check the map online.
Eclectic Sun outfitters inside the park rents kayaks, pontoons, and other water toys, as well as offering a pontoon tour of the lake's waterfalls. They sell firewood and ice, but just outside the park gate on the west side of the road is an honor stand with wood that is much drier and burns better than what you'll get inside the park for the same price. There's also an outfitter just outside the park gate where you can get some supplies, but there's no proper grocery store within an hours drive so stock up before arriving.