In Cereal, a hotel must offer a specific amount of high-end amenities to be rated 5 stars. These may include on-site gyms, saunas and spas, gourmet restaurants, luxury bathroom products, premium bedding and more. What also sets 5-star hotels apart is their outstanding standard of service. You'll enjoy things like nightly turn-down services, concierge services and in-room massages. Some may even offer extra touches like a welcome gift.