I'm quite lucky Peter, I live right at the southern edge of the Metro area. Down here I'm couple mins drive from the beach, wetlands, hills and fields, rivers, open park lands, national parks reserves and then only a short drive to country areas. I get a great deal of the subjects around the Onkaparinga river not too far from the mouth. Theres a few quite large reserves around there. Theres also some other ones not far away on the coast. I get a few at some of the forests not far from me like Kuitpo forest.
Then I go further down south to Goolwa and Victor Harbour out to large the national park at Newland Head. A few of the birds I go to the north side of town were I know some are kept, and theres always the walk-in-avery at the zoo but not always so easy in there for good shots with all the people and kids running through. The rest I get from other states when I travel, but most of the captures I get are just around the river and wetlands right here down the road from where I live.