No, you don't have to swim across or get on a ferry to reach the island. With bus service 84 from Punggol Interchange, you'll drive through Punggol's residential estates away from the HDB clusters in the new, developing. Alight at the now-defunct Punggol Ranch where you can walk to the boardwalk at Punggol Beach that leads to the island. Stop by The Punggol Settlement to get some water or rent some bikes – though you can trek the entire island by foot – before you head to Coney Island. Alternatively, you can enter from the other end of the island from Lorong Halus Wetlands.