"The best river & sea outfitter on Earth!" - National Geographic Adventure. Headquarters based in the Sierra Foothills, O.A.R.S. offers a variety of 1-day and multi-day adventure travel options including: whitewater rafting, sea kayaking, hiking and multi-sport trips across the western US and internationally. O.A.R.S. caters to active travelers of all ages and abilities with experienced, professional guides and top notch equipment and today offers more than 75 unique itineraries worldwide.