There are two active volcanoes in Hawai'i Volcanoes National Park, Mauna Loa and Kilauea, but Kilauea is the real "must-see." A 4,000-foot-tall mountain, Kilauea has been active since Jan. 3, 1983.

Surprisingly, fascinating Pu'ukoholā Heiau National Historic Site in Hawaii is one of the least visited National Park Service units in the country I love Hawaii and I love national parks. And, as you ...