In Diaz, a hotel must provide a specific amount of upscale amenities to earn a 5-star rating. These may include gourmet restaurants, saunas and spas, on-site gyms, premium bedding, luxury toiletries and more. What also sets 5-star hotels apart is their superior service. You can expect things like nightly turn-down services, concierge services and in-room massages. Some may also offer special touches like a welcome gift.