Just did a bit of research re flights.
Would it be easier to fly to Sydney or Canberra?
Jetstar have return flights Perth to Sydney for about $370. But then I would have to get a ride from Sydney to Merimbula. They dont fly to Canberra.
Virgin Blue have flights to Canberra return but will have to fly via Sydney for about $460.
Lets say hypothetically that if I do decide to go to the Mambo I would need to find a ride from Sydney or Canberra. Google tells me Merimbula is about 444km from Sydney and 257km from Canberra.
I would fly in Wednesday arvo and fly out Monday morning and would also need a place to stay.
Also I would need a board or two and some windsurfing gear

As you can see its such an effort just to get over to the other side of Australia