New Jersey State Aquarium , Camden, 856-365-3300. www.njaquarium.org. The 760,000-gallon Open Ocean Tank is one of the largest in the country. Interactivity is a part of each Aquarium exhibit, drawing in children and adults alike. The entry rotunda is adorned by a massive seven-foot-high open jaw of a Megalodon shark, extinct for 10,000 years; it leads to the Shark Zone, where other shark jaws are mounted in display cases around the Touch-a-Shark tank, its rim crowded by children.