Discovery Jet. Zoom along the glacier-fed Rakaia River with Discovery Jet as you journey through the deep canyon and braided courses of the river. The Rakaia's jewel-like aqua water contrasts wonderfully with the white limestone cliffs and views of Mt. Hutt ski field. Fishing and scenic tours are options or catch a ride up to the Rakaia Gorge Walkway. Tours vary from 15 to 45 minutes and are suitable for all ages. Canterbury. 0800/538–2628; 021/538–386; From NZ$45 for 15 mins.