Waggles,
you can sail Connewarre on a northerly from this spot but I haven't done it in years. To the left of the launch it gets mighty shallow and I can't remember how much water you have on the right. Also rocky at the launch area.
On a northerly, best bets are barwon river on any tide but low tide gives you some great flat water see
http://www.coastalwatch.com/camera/cameras_large.aspx?cam=5730&state=VIC (this will show you the tide at the mouth)
or Point Henry
www.coastalwatch.com/camera/cameras_large.aspx?cam=5630&state=VIC&t=7:21:13%20AM&camName=Geelong%20LimeburnersHope this helps. I work shift work so drop me a pm and I might have the day off for a sail and could show you some spots..