Aah down south - get ready for some real power!! There is a good chance you will return with 2 boards..
There are no secret spots left down south anymore - but the sup will give you some advantages in the surf to make the most of crowds and shifting peaks.
margs is blown out alot at this time of year - you might get lucky.
chances are the open ocean breaks will be blown and massive at this time of year - check out southpoint and huzzas (right under the carpark) (and northpoint if yer game!) in cowaramup bay.
if you are around Dunsborough check out the farm - alot of that coast is nicely sheltered from westerlies - its a super fun wave for standup when its 1 - 3 ft. here is a little happy snap of the farm. 2.5 m and more of cape naturaliste swell should see that bit of coast open up for you.
as the swelll gets bigger alot of mysto waves wrap right into the nne facing part of the coast - some classic waves to be found around the millionaires mansions of eagle bay...
have a great trip.