I won a trip worth $1500. What will that mean for my taxes?

Yesterday I called into a radio station and won 2 airfare tickets, hotel room, and concert tickets worth $1500. I've never won anything before, but I know when I file taxes next year I'll have to pay in. How much approximately will I have to pay in? If it's a lot I'm not going to accept the prize. It wouldn't be worth it.