Relief for a Really bad sunburn?

So i went planned a trip to the water park with my 3 nephew and applied sunscreen and went on my way. we spent 5 fun hours there and they all tanned to perfection. Needless to say i got burnt like a lobster. My face, back, stomach, arms and legs are all fiery red.The only place where i'm not burnt is where my swimsuit was. Any tips for bad sunburn Relief?