Once you have left the heads of Port Phillip Bay your out at sea with no turning back, you will leave the bay on an outgoing tide.
I was one of the crew on an S&S 34 and hit rough weather about 3 hrs out of the Bay....surfing down waves with just a storm jib doing 15 knots and other waves at times breaking over the stern. [I was sea sick for 48hrs and just wanted to die]
There are many coastal races in Victoria [or used to be] like Queenscliff - Port Fairy, Queenscliff - Portland etc., that would suit your needs either in the race or the return trip.
As a teenager I did several return trips from Portland to Melbourne and had a ball.
Is there a Crusing Yacht Club of Victoria? if so start there.
Now called Ocean Racing Club of Victoria.
www.orcv.org.au/