In this topsy-turvy aquarium sharks and stingrays swim over and around you in transparent tunnels that were once stormwater tanks. You can also enter the tanks in a shark cage with a snorkel ($124), or dive straight into the tanks ($265). Other attractions include the Penguin Discovery tour (10.30am Tuesday to Sunday, $199 per person) where just four visitors per day can get up close with Antarctic penguins. For all tickets, there are significant discounts online.

A free shark-shaped shuttle bus departs from 172 Quay St (opposite the Ferry Building) hourly on the half-hour from 9.30am to 3.30pm.