Diamond Lake is a 500 metre walk from the car park on the Mt Aspiring Road.
Ashort, steepish climb up a track from there gives you a good view over the lake:
If you carry on up the track you get to Rocky Point which gives wonderful views across Lake Wanaka:
There are also good views up the Matukituki Valley and had the weather co-operated we’d have been able to see Mt Aspiring which is somewhere under the cloud:
It took us an hour and two minutes (and 19 seconds if you want to be precise) going up the west track.
Last time we did it we took an hour and 10 minutes up the east track – I”m not sure if the difference in time is due to the walkers’ condition or the different route.