1. Explore the lagoon
Muri Lagoon, on the eastern side of the island, is straight out of a travel brochure: aquamarine water, blinding white sand and palm trees. Grab snorkelling gear, a kayak or a stand-up paddle board from your hotel and set out on your own, or tag along with Koka Lagoon Cruises for ukulele singalongs, coconut-husking and all-round good times.