Geocaching: The treasure hunt is on

Kenny Jenkins holds a tube that will mark the site of a geocache he will place in about 33 feet of water in Lake Denton in Avon Park, Fla.  (Wilfredo Lee / Associated Press)

Kenny Jenkins uses a lift bag to help him carry a weight and geocache marker to place it in about 33 feet of water in Lake Denton in Avon Park, Fla.  (Wilfredo Lee / Associated Press)

Lisa Kingsley and daughter Hope Kingsley, 10, of Salem, Ore., seek out a virtual cache along with Paul Harris of Springfield, Ore., near the duck pond in Stewart Park during the Discover Roseburg geocache treasure hunt in Roseburg, Ore.  (Michael Sullivan, The News-Review / Associated Press)

This cache, found by Tim Vail, is big enough to hold some quirky treasures.  (Annie Wells / Los Angeles Times)

Young treasure hunters sift through the contents of a geocache in Avalon, Catalina Island.  (Tim Hubbard / Los Angeles Times)