Based on current Bay forecasts, if Sandringham is the outer limit of your travels, I'd recommend:
Tues - Southerly, 10 knots early strengthening during the day - Sandringham or Hampton (so as to avoid the black mud near the pier at Sandy) beach early, staying in the shelter of the Sandy Yacht Club, or even St Kilda inside the harbour. Take a windsurfer or kite and move down to Ricketts Point for a really good sail in the afternoon

.
Wed - S to SE pretty strong from late morning - as above or, if a lot of east in it, any of the beaches from Ricketts Point up to Green Point in Brighton.
Thurs - Strong E early, dropping and going N/NE later morning and NW in the afternoon - probably stay around St Kilda or Point Ormond.
Fri - N/NW strong early - I'm sure DJ is keeping an eye on this - join others in the inevitable downwinder from St Kilda - Sandringham. Otherwise, in the lee of the harbour at either St Kilda or Sandy when it goes southerly late morning.
But, then again, this is Melbourne and the outlook could all change in 24 hours!