 You know, our trails are beautiful. You want to bring plenty of water so you can enjoy them. Garthwaite noting you should try to drink close to a gallon of water if you're going to be active on a hot summer day. The National Park Service says a father and daughter were found dead in Canyonlands after they got lost while hiking and ran out of water. Later that same Saturday, the Santa Clara Ivins Public Safety Department says a woman was found dead after suffering from a heat-related incident at Snow Canyon State Park.