Spend a day snorkeling at Hanauma Bay, a protected nature preserve on Oahu's southeast coast that rents out snorkel gear and a supply of fish food guaranteed to work the wildlife into a tizzy you'll never forget. Tickets start at $7.50 per person, free for children under 3 and Hawaii residents and it costs $1 to park. Open daily except Tuesday.
Split Rock Lighthouse, Lake Superior near Beaver Bay, Minnesota. Completed in 1910, has been dark since 1969 except for an annual lighting on November 10 to commemorate sailors lost in Great Lakes shipwrecks.