On Koh Samui the appetite for luxury villas is undampened – witness Samujana (www.samujana.com; villas from $825 per night; living room, first picture), a collection of ultra-contemporary serviced residences on the island’s northeast coast. Ranging from three to eight bedrooms, they tumble down a hill that alternates hypermanicuring with unfettered jungle, all the way to the jade waters of the Gulf of Siam. For a bit of hi-lo fun that typifies the island’s nightlife, there’s Choeng Mon Beach nearby. And for those preferring to concentrate on world-class detox and wellness, Kamalaya (www.kamalaya.com; from £240; tea lounge, second picture) has seen in its 10th anniversary with a total makeover; its guest villas, all redesigned, have been augmented with 16 one- and two-bedroom suites. Kamalaya’s cuisine is notoriously delicious enough to put paid to guests’ best weight-loss intentions, but the new state-of-the-art fitness centre and 25m pool should help redress the balance.