NJ spray grounds & splash pads in summer 2021: Many are free There are also a few that charge a fee. We'll get to those, too. It's always good to check the park's website and maybe even call ahead before making a visit, as lingering pandemic restrictions in addition to maintenance and repairs can unexpectedly put a damper on plans. 156 Mettlers Rd, Somerset Open daily noon to 8 p.m. every day until Sept. 6. After that the spray park will be open weekends, noon to 7 p.m., until September 26. After delays in 2018 and continued issues in 2019 — the pandemic halted this 6,500-square-foot park's reopening until now. The park is behind the Morgan Pellowski Playground, close to the Putting Course and Paddle Boats. Parents are allowed to accompany small children into the kids-only facility.