Thanks for the replies. I have an 8 and 10 meter kites with twin tip and have done 100+ km a day coastal downwinders before so I guess I'm that person. Good way to see the coastline and find some nice waves and flat spots along the way. I'm less interested in waves than in cruising and exploring.
I've never been to Perth but hope to for the last week of December and a riding buddy is usually always good a good thing.

Unless I'm mistaken from what I can see on maps garden island and point perron don't have too much altitude or is there a significant wind shadow behind perron? Or is it rideable wind just a bit dirty? Vague idea would be to do the scenic route around the island or cross the road on the island to cut out most of the "offshore" wind ride but stick closer to land/bridge on the leeside for some.
Cool doesn't sound like a blanket ban on downwinding past the navy or shipping and port areas just give them a wide berth.
Sounds like a good trial ride and downwinding further north also would be beautiful but I think I'll be restricted to public transport. Haha yay crabs in asses. You cats never get a northerly?