In Sono-ri, a hotel must offer a specific amount of high-end amenities to be rated 5 stars. These can include on-site gyms, saunas and spas, gourmet restaurants, premium bedding, complimentary luxury toiletries and more. What also sets 5-star hotels apart is their extraordinary service. You can look forward to things like nightly turn-down services, in-room massages and concierge services. Some may even offer extra touches like a welcome gift.