Hotels line the shores of number-three Kahanamoku Beach on Hawaii's island of Ohau.
Erosion wise, Kahanamoku Beach is very safe, Leatherman said. "It's protected by an offshore reef and jetties from the boat harbor, so it doesn't really get any wave action."
Leatherman uses 50 criteria to evaluate beaches around the country, including water and sand quality as well as safety and environmental management.
For each criteria, a beach is given a score of 1 to 5, with five being the best. A perfect beach would therefore have a score of 250, but Leatherman said he hasn't found a perfect beach yet.
"I've found a lot of great beaches so far, but I'm still looking for the perfect beach," he said.
(See "Pictures: :Worst Beach Destinations Rated.")