The Capt. Cook Monument is a popular jump in spot for snorkeling in Hawaii's Kealakekua Bay. (Terry Richard/The Oregonian) Hawaii's Big Island just may have the best hike in the United States.

One of the Big Island's most famous waterfalls ... Everyone knows that the snorkeling in Hawaii is unmatched, but do not skip out on night snorkeling with 1,000-pound manta rays (no, they are ...