Well the single room with about five original artefacts could have been a little more ambitious. Sure ChCh wouldn't mind loaning some more stuff. The video is worth the entry fee, particularly if you are new to NZ or a tourist, give a very comprehensive history.
Don't walk by, take a look, don't expect a London museum and you will enjoy it. Unlike the wanky American (off a cruise ship) observed "is that it!" It is worth it and a good effort from the town to present some of its history. If you want the fuller history take the walk, that is brilliant and given it is a distant you can be confident you won't bump into any fat loud Americans. Bliss
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