We usually go to a popular park, meet with a big group of friends and listen to the Triple J Hottest 100 Countdown, which is what we did.
The day involves swimming, fishing, music and catching up with friends.
I generally avoid crowds on Australia Day as over the past few years I've noticed every public place seems to be swarming with bogans off their heads, wearing the flag as a cape and not much else.
But the park, although crowded, was peaceful in terms of behaviour.
Police drove quad bikes up and down the strip and the only word our group, or any group near us, got was 'Please put your empties in the bin'. (Which was nice, if they wanted to, several of our friends could have gotten fines for drinking in a public place - which is actually illegal...but, I guess that's Australia for you.)
I bought DF's sisters birthday present yesterday too. We got her a $40 bookstore voucher and some Billie Goat Bath Milk Soak for $10.95 (two baths' worth). Billie Goat Soap is something I heard about years ago, and I had to look everywhere to find it. Basically every product that is made by the company contains only natural ingredients and is good for sensitive skin/children/elderly/allergies etc etc.
Also spent $8.75 on dips and crackers for the park gathering, $5.30 on an iced latte, and by the time we got home did not feel like cooking so ordered in pizza: $27.45 (damn 15% public holiday surcharge!)