If you're traveling to Hawaii, USA, and not renting a car but going on foot, this is a must-have item! I purchased the Blue Line, and it's a highly recommended line because it's great for comfortably enjoying the beautiful Hawaiian coastline without renting a car. There are several lines available, but it's the best for staying in Waikiki and getting around without a rental car! The Blue Line has high satisfaction, but other lines are also popular, so you should purchase according to your travel style!!!!!!