In Similan Islands, a hotel needs to offer a specific number of high-end amenities to earn 5 stars. These can include on-site gyms, spas and saunas, gourmet restaurants, complimentary luxury toiletries, premium bedding and more. What also sets 5-star hotels apart is their guest-centric service. You’ll enjoy things like nightly turn-down services, concierge services and in-room massages. Some may also offer special touches like a welcome gift.