I know you are probably stressed and it's totally understandable, but what you have to remember is that the resorts are usually pretty safe. If your really concerned you can wear a mask at the airport until you reach the resort. Have you tried to contact your WC, photographer or hotel to see if they are worried at it there, and what they are doing to prevent problems?
IMO, if I were in your shoes, I'd still go and get married there. :-) Just accept that some of the family may not want to go, but it's your and your FI's day, the Sheraton is a beautiful resort, and the grounds are very spread out. I think the media is blowing things way out of control, as they do with everything. You just need to know what to do to be safe, take those steps and enjoy your wedding/honeymoon