The Great Barrier Reef is amazing! I live in Sydney, Australia and went on holiday there.. you can get on a boat and they take you out literally into the middle of the sea and there's a roped off areas where you can snorkel or go off in glass bottomed boats and submarine-like boats. the islands are nice too (:
Lila
Been to Machu Picchu and the Pyramids and they definitely deserve to be on this list! I would love to see the Great Wall of China though.