On its own private peninsula on Phuket’s west coast, the ultra-luxe Aman brand has the retreat to match its glittering reputation. A Shangri-La of jungle-fringed pavilions set against a backdrop of endless turquoise sea, its signature “immersions” – including the original three-night Wellness Immersion – offer a daily menu of relaxing massages, facials and body wraps through to IV nutrient infusions and body-sculpting sessions.