First thing - there is no doubt that when the water is blue/green this place is probably amazing. The other reviews confirm that. However, I happened to go the day after *a lot* of rain. Unbeknown to me this has the affect of turning the water a dull grey colour (somehow). Everyone there was quite disappointed and underwhelmed. I was also attacked by sand flies. Attacked. Like in seconds they were on to me.
Like others have said, this is 35km from Hokitika so a decent drive. For some reason my hostel convinced me it's a good cycle ride... Me being an idiot hired a shoddy bike and undertook a 70km round trip. Never again. Perhaps on a decent road bike, but not on a hostel mountain bike. Obviously me cycling has no bearing on how good the gorge was. The scenery is nice etc but it's not worth the bike ride IMHO. At least I earned a beer that night.