G'day James,
I'd suggest downloading the Sydney Basin Visual Flight Guide -
http://www.casa.gov.au/wcmswr/_asset...oad/sydney.pdf
It's recently updated to include the new changes from GAAP to Class D and has a pretty comprehensive breakdown of Vic 1 and the Sydney Harbour scenic route.
Also, do ask around and get advice before hiring an aircraft in Sydney - there are a few schools with fairly dodgy reputations regarding maintenance. Of course, it would be the height of bad manners to list em here, but feel free to pm.
Just a word on CASA too.....when I had to get my licence validation to go to the US, they arsed it up AND charged me $50 for the pleasure! My advice would be regarding anything that involves CASA: plan well ahead of time, and be prepared to be fleeced outta $50 every time you fill in a form...
Sydney's an amazing city to fly around (you can usually get right into the harbour and orbit the quay) and April's a fine month, usually, weather wise.
Good luck with your planning,
GWaS