Hafnarfjörður is famous for its large population of "hidden people," particularly elves, and local medium Sigurbjörg "Sibba" Karlsdóttir can help you find them. Hidden people pop up along the tour route, which should intrigue young kids, even if the costumes aren't terribly convincing. Afternoon tours leave twice per week in summer and last 1 1/2 to 2 hours.