Nick
Google Anna Bay. To get to Birubi Point take James Paterson St and follow it until you reach Birubi surf club. If its windy there is usually a crew out sailing especially on a weekend.
As for North Entrance, the wind is disturbed by the houses on the beach which makes it very gusty to sail.
Dont know if you have a car license yet but if you have take some time too explore the coast. You may find a new spot to sail. But make sure you tell me if you do.

Cheers