From the power pylons, follow farm tracks up the Rainbow River; this is the main access route to excellent climbing in the headwaters. Two hours of easy riverbed travel brings you to a gorge. Rainbow Hut (4 bunks) on the south bank is now controlled by Rainbow Station. Climb around the gorge on a stock track on the true left and descend to Rainbow Junction flats.
From the junction, it is about 1½ hours travel up the Rainbow to a second fork; the north branch gives access to a delightful tussock basin under Kehu Peak, and the south branch leads to Mts Paske and McKay, and a good saddle to the large tarn source of the East Sabine.