Australia's largest aquarium will take you on a journey to tropical reefs, mangrove forests and granite shores. Its three-million-liter tank is 40 meters long and 20 meters wide, and is home to about 400 species of marine life. That life is up-close-and-personal when you enter the 98-meter transparent tunnel through the tank. To get even closer, pay a fee to snorkel or scubadive in the main tank. Another notable highlight of the aquarium is the seal enclosure.