The main difference between a 3- and 4-star hotel in Gruinard Island is the quality of service and availability of creature comforts. 3-star hotels are usually more budget-friendly and offer the amenities and services you need for your comfort, such as a gym, WiFi and breakfast. You can expect a little bit more at a 4-star hotel — think upscale furnishings, deluxe toiletries and perks like on-site spas.