If you can't decide between a quiet island escape and all-in revelry, Thailand's Ko Pha Ngan offers the best of both worlds. Home to the infamous full moon party, the island is also blessed with small coves perfect for lazy days filled with nothing but sand and sunshine. Thailand's largest island, Phuket, is rich with picturesque coastline and offers intimate snorkelling and diving in the sparkling waters of twin islands Ko Racha Yai and Ko Racha Noi. While it is often touted as a top skiing destination, Japan also adds stunning beaches to its repertoire of natural beauty. This includes the small but spectacular Zamami off Okinawa which is especially popular for kayaking and whale watching.