The Rocks Amazing Sydney Harbour Treasure Hunts. 1.5 - 4hrs. Ideal for large Groups 10-500 people in Sydney's The Rocks. Make your mark in Sydney History. Complete a terrific fun land based or combine with water taxis or Jet Boats to Sydney Harbour Treasure Island hunts. Discover The Rocks legendary Pubs, cobblestone lane ways, haunted buildings on an entertaining Rocks Sydney treasure hunt for Corporate and Social Groups day or night.