The highway negotiates three sharp curves : Maulua ( mile 22 ) , Laupāhoehoe ( mile 26 ) and Kaawalii ( mile 28 ) . Maulua Gulch has a small waterfall emptying into the ocean ( visible from the Hilo side by looking across the gulch ) and another in the back part of the gorge near the base of the radio tower . Also , an abandoned railroad tunnel is sometimes visible from the Hāmākua side . The Laupāhoehoe Railroad Museum is located on the “ mauka ” side past mile 25 . On the other side of Laupāhoehoe Gulch , an access road leads down to Laupāhoehoe Point Beach Park where the victims of the 1946 “ April Fool ’s Day ” tsunami are memorialized . Past Kaawalii Gulch lie the much-welcomed passing lanes as Highway 19 goes by the old sugarmill town of Oōkala
1946 “ April Fool ’s Day ” tsunami
1946 Aleutian Islands earthquake
Hawaii Belt Road