Its a bastard that Crohns, ex girlfriend had it and if she happened to eat a seed or skin from fruit etc she would be crying in agony and usually resulted in a trip to A&E, she had several surgerys when she was younger to try and correct it.
Hopefully someone can sort you out mate, my only advice would be to drive through Arthurs pass, pick a creek on the west side of the township (or east, but west side is easier/quicker access to the tops) and go for a walk up it.
Good luck with it all, hope your sister gets on top of things and you get to see the old boy sometime soon.
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