Reduce sunburn and redness?

I was hanging out in the sun today, even though I had sun protection on (30) I still got a bad burn all over. I'm going to have to go back to school soon and I really don't want to be able to pass as a tomato. I'm applying Aloe Vera after-sun regularly but are there any other ways to reduce the redness? I don't expect it to suddenly vanish but what's the best way and quickest to reduce redness. Thanks. xx