We are going on our first cruise the end of Feb. and plan to snorkle. Problem is that I wear glasses and don't see very well without them. I really don't want to spend the $$ to buy a prescription mask which is only going to be used a couple of times. Even if we crusie again which I hope we do, my prescription has been changing evey two years. Thinking I will just have to not wear glasses and see what I can see. Any suggestions??