Arenal is a very popular tourist area, mainly because of the active Arenal volcano and the crystal-clear Lake Arenal. Many Arenal hotels offer a perfectly safe “doorstep” view of the volcano and its brilliant red flow of lava -- Arenal National Park allows visitors an even closer look. The volcano is located at the southern end of Costa Rica’s largest lake, Lake Arenal. Popular activities in the area include fishing, windsurfing, boating, canoeing, mountain biking, horseback riding and hiking.