"Long Beach Island has some of the clearest water I've seen in New Jersey," Leatherman says. The 18-mile-long barrier island has several beaches and communities to choose from, and the water temperature is ideal. "It's pretty much in the high 70s, maybe low 80s," Leatherman says. "Water temperature in Jersey is good." Leatherman also recommends making a stop at Barnegat Lighthouse, a beautiful spot on the northern tip of the island.