Just like most accessible tourist destinations, there isn't much of a chance for you to get a truly unique shot as the vantage points are finite. However, that shouldn't take away from the beauty of the location. The rapids is stunning and the water light blue as as advertised.
It is right off the highway on the way from Rotorua to Taupo and the carpark is a mere 10 meters from the actual rapids. Be ready to fight for a parking spot if you go during a busy season.