Beer making. Not traditional home brew but at a beer factory:
http://www.thebeerfactory.com.au/
Me and a few mates go select the type of beer we want to brew, get the ingredients and cook them up then leave the fermentation storage and clean up to the guys at the factory. 4-6 weeks later we turn up and bottle it while tasting a sample or two. Can't think of a better way to spend a Saturday afternoon.
@ Jim, loot what the beer of the month is:
http://www.thebeerfactory.com.au/beer_of_the_month.html
Bloody good fun and tasty too.