We were unable to get a full-hookup campsite at the south entrance of Zion National Park for the first 5 nights of our trip. Fortunately, there was availability at the St George/Hurricane KOA. There is plenty to do in this area – access the Kolob Canyon entrance of Zion NP, and several State Parks such as Sand Hollow and Quail Creek State Park.
Quail Creek is less than a mile from the KOA so our first day in southwestern Utah was spent on the lake. We e-biked the short distance to the park entrance and paid $5/person day-use fee. There is a campground here with access to the lake. Campground: $25 per night for the primitive site and $38 per night for a site with power and water.
DIG Paddlesports rents one or two person kayaks and paddleboards ($25-$35/2hrs). People working there are friendly and helpful, emphasizing water safety. Afternoons are still 90+degF in late September so spending the morning on the lake was a cool break.