San Carlos Falls is a small inland waterfall reached from the Hagåtña area, offering a quick change of scene from beaches, memorials, and Spanish colonial sites. The attraction is simple: a shaded walk, tropical vegetation, and falling water after rain.
Go only with current local advice, because trail conditions on Guam can change quickly with storms and overgrowth. It is best for travelers who already have transport and want a brief nature stop rather than a polished, signed park experience.