I just got back from a trip to NYC in which I used part of my refund to pay for. My flight was already paid for by my employer because they sent me to a week long training in Parsippany NJ, so I just had them book my return flight 5 days after my training ended so I could head into the Big Apple for a little vacation. All I had to do was pay for my hotel for my extra time in NYC, food, and anything else fun I did while there. Had a blast and can't wait to get back.
The rest of my refund is in savings right now.