Hi Olly84,
The seabreeze is usually I bit lighter in Mandurah but you can still get out most days in summer.
There are plenty of spots to choose from, flat water in the estuary, reef breaks to the south and beach breaks to the north.
Most of the guys/girls from Perth don't make it past Safety Bay so it is rarely crowded.
Friendly locals down here, good family vibe.
Bring a 6,9&12m kite, surfboard & twinny and you'll be set.
See ya out there,
Moons.
Oh,...Bring some wind with ya if you can
