If you're traveling to Hawaii, USA, without renting a car and prefer to explore on foot, this is a must-have! I purchased the Blue Line, and I highly recommend it because it's great for comfortably enjoying Hawaii's beautiful coastlines even without a rental car. There are several lines available, but if you're staying in Waikiki and want to get around without a car, this is the best! The Blue Line has high satisfaction, but other lines are also popular, so you can choose one that fits your travel style!!!!!