have a look at this map
www.seabreeze.com.au/gallery/gallery.asp?imageid=1000&shownew=on as toby suggests Salmon Bay is probably the best option in a SSW (launcing around where the number 7 is on the map) although I have also kited both sides of the point (natural jetty) near Kingstown Barracks but once past the point, if it goes belly up, your next stop maybe Lancelin or the very narly phillip rock just offshore!
On the inside (Salmon Bay) near Fairbridge Bluff you may find some small surf. There's also a wave off salmon point (chickens) and a bommie which breaks on big swells in the middle of the bay towards Mary Cove.
Thomson Bay on an easterly is also an option launching from the natural jetty but there are heaps of moorings to negotiate and if you drop your kite chance are you will snag on one of them. Would love to kite transit with some swell on a good ENE'er.
Anyone ever kited Parker Point?