We're going on a western Caribbean cruise in early February. One of our excursions is to a beach in Cozumel which restricts sunscreeens to biodegradable (to protect the reef). I am very sensitive and need a good ss to control my melasma. Any suggestions? Right now, I use Sheseido spf 55 cream on face and Neutrogena Dry Touch spf 55 on body.

Jane