My pennies' worth:
Do what you've been trained for. If you've never done a downwind auto, go into the wind. Better to be able to land (splash) in a controlled situation than land hard out of control into the water. A downwind auto is just different.
If you're flying a lot in this circuit with this winddirection I would definitely train for downwind autos to the beach.
I would recommend lifevests to be worn in this situation though, you're going to swim, in the deep or shallow end. Even if you choose for the shallow part, keep the currents in mind. They can easily take you out to sea.
Basically you're too far from land (you cannot make an emergency landing on land with an engine failure), keep that in mind.
Regard,
Copter D