Unfortunately, Biscayne Bay is only 10-20' deep in most places so going turtle is out of the question there, but getting the boards up will keep if from popping up the hull in the bigger gusts.

To be able to steer (to a safe beach/harbor), you have to have forward motion, so here's another option; drop the main, roll it up and sail to a beach on the jib alone. Of course you can't make upwind progress but at least you'll be able to keep the boat upright and have some steerage.