Went there years ago when I lived in NZ. Great spot, but there are others nearby. Go to far end of track, turn right until you get to a small bridge, then follow track on left – K Creek runs below, and there are several other pools on this stretch, well hidden!
Okoroire Hot Springs Hotel
Lower pool with gravel base
Okoroire Hot Springs Hotel
Lower riverside pool
Okoroire Hot Springs Hotel
Top pool, formally enclosed prior to recent redevelopment.