The principal difference between a 3- and 4-star hotel in Tharsis is the level of service and availability of creature comforts. Three-star hotels are usually lower priced and offer the services and amenities you need to be comfortable, such as breakfast, WiFi and a gym. You can count on a little bit more at a 4-star hotel — think upmarket furnishings, premium bathroom products and perks like on-site day spas.