Summer Fun for Children! Hi-Hills is a Day Camp for children ages 3-14 located in Gladstone, New Jersey on the borders of Somerset and Morris County. At Hi-Hills, the emphasis is on the overall development of the camper. Hi-Hills has been providing a quality camping experience for children since 1966. Campers are encouraged to explore a wide variety of activities within a relaxed atmosphere. Campers are involved in arts and crafts, athletics, swim instruction, and environmental programs meeting the needs of all youngsters. Instruction is provided with attention to each child as an individual. Creativity and expression are encouraged as well as self improvement in physical activities.