Kizzy: Welcome! I will have to go look where the islands are, I have heard of them, but did not realize that's where they were located. Good for you on the 11 pounds! That's always a nice feeling. Remember as you lose weight if calorie counting, you will need to continue to adjust down your totals as pounds fall off. I don't know if you have a phone or iPad, but there are some good apps that can help figure this out for you.
Swimming - I did that for a while before I moved, I took off about 30 lbs. I too was worried about my size, that I was a swimmer, not a great one. Guess what? Who was looking? I went at 5 in the morning because I wanted to swim before work. It was me and 4 old men, one old lady. Our body shapes were all over the place but the one thing we had in common was that we were choosing to move our bodies as best we could. We didn't have time or the inclination to pass judgement on someones skill or shape. Most times as it went on it became a moment for pleasant convos before the pool officially opened. Enjoy your access to water year round - swimming right near the ocean sounds divine. One thing you might incorporate is using a kick board. If you have issues w/arthritis break up your laps with just kicking back and forth.
Again welcome and jump in!