Jesus you guys are funny pricks had a good old belly laugh. You are also complete wankers.

Dude the sport has grown and is growing at such a rate posting a request about a certain spot is unlikely to yield serious replies.
In mandurah you have an enormous body of flat water, so use it. Not quite as good as bibra lake though...

Avalon is the sketchiest launch you will find in WA, due to the beach location in reference to the prevailing winds and the farqin wanker rich houses that have now been built -avalon used to be heaven on earth, not anymore. The cut destroyed it (but did save to estuary).
The wind on a south west or better west south west is tolerable but the southerly is sketchy again.
As far as waves, hit margs, avalon is crap, if only for a few days a year.
Also if you do go down there watch out for waveslave, you don't follow the rules of engagement he will have your guts for garders!
i.e. a very localised spot, so watch , learn and follow because if waveslave doesn't nab yab ya the winsurfers who have used the spot for decades will!
Better spots around, better to go flat water in mandurah.