Since he shot in RAW, does it matter what WB he chose? When importing into PS, you can choose Sunlight for instance. Try that and see what it does (since you say sunny).. looks a bit cloudy to me, so you can try that preset as well. Ofcourse the card as Donald suggested is the best way, but sometimes you just don't have the time to do that.

What is a friend? A single soul dwelling in two bodies. - Aristotle
-= Glass Eye Photography =- -= My Rendo Gallery =-