How do I get rid of a sun burn?

It doesn't hurt or anything but it looks embarrassing. I have been a a fishing trip and I was wearing crocs, (weird sandal looking like things with holes on the top) The holes on the top caused sun to come in and give me a tan just on those spots. Now I have a really white feet with random polka dots on it. I take martial arts and it would be really embarrassing to walk in like that. Any tips?