Marbo Cave is a coastal cave just minutes from the northeastern coast of Guam. The fresh water in the cave supplied the Japanese forces during their occupation in the early 1940s. After World War II, the U.S. Army used the water source for its military camps until 1950.
Today, the cave is a recreational site usually packed with people on the weekends. Although it is no more than a five to 10-minute trek, even small children can manage the hike with the help of an adult.
Children can play in the more shallow areas while older kids and adults can jump from the rocky platforms into crisp waters. Past the rocky wall is a deeper pool for more experienced swimmers.