Entirely feasible if you're keen and you have a torch. Just remember that the main gate to the park closes at dusk and doesn't re-open again until dawn, so if you park inside this you won't be able to get out with a vehicle, but there's nothing stopping you from leaving your wheels at the gate and walking on the road for a bit to and from the start of the catch pool track to the hut. All up it should be no more than an 1 & 1/2 walk each way on a good well marked track. Also be aware of police check points on the roads back if drinking.   

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Alyn
027 446 5275
Alyn.Higgins@hospitalitynz.org.nz