How to stop a sun burn from peeling?

So on Sunday I was out on my family's boat for about 2 hours. I got a tan everywhere else but my shoulders got pretty red and sun burned. They itches about a few hours after then just stayed red. Once I got home I put aloe vera gel and later on aloe vera lotion on. It started to turn tan a few days later but now it's peeling. How can I prevent it from peeling and keep my tan? Also we are going out on our boat again this weekend so should I keep my shoulders covered or just use a lot of sun screen?