Guide to Choosing Tandem or Single ATV Quad Bike Ride. Bali quad biking or ATV (All-Terrain Vehicle) is an outdoor adventure activity that will invite you to explore muddy terrain, jungle, rice fields, rocky terrain to climbs in the middle Jungle of the Ubud. This activity is perfect for those of you who want to pump up your adrenaline by involving ATV Quad Bike. ATV Quad Bike Adventure can be done alone, or tandem Ride