Rafting - Buller Adventure Tours. Few rivers rival the mighty Buller for big volume whitewater action. We raft the big volume 'Earthquake Rapids', the largest volume whitewater section of the Buller River. This action packed 1/2 day river adventure provides a variety of invigorating experiences. Our professional river guides cater for all thrill levels, with the emphasis on fun, participation and safety. River challenges include an optional 9m cliff jump, Grade 2 swim rapid and inflatable kayaks.