A New Jersey campground is undergoing some changes this summer to debut Yogi Bear’s Jellystone Park in the Garden State. After acquiring Hospitality Creek Campground & Swim Club, Northgate Resorts is transforming the Williamstown site into a Jellystone Park. Williamstown’s new Camp Jellystone, located at 117 Coles Mill Rd., encompasses over 90 acres of land. The campground-resort features an olympic-size swimming pool, diving docks, a jumping pillow, a water obstacle course and a 30-acre lake used for freshwater fishing. The campground currently has 233 campsites, including two cabins and six …