Never go out without sunglasses, someone told me it can lead to cataract more easily when getting older.
I wear snow googles for windsurfing. I tried swimming googles before, and the straps will make you painful if you windsurf for the whole day.
I tried normal sunglasses before, but there is no anti-fog, and there is no straps
I found snow googles the best. Its large area protects more UV from the sun, and offer protection to the eyes on impact. During high speed, you don't know what might get you into your eyes if you fall into the water