Spending your winning on 'a nice holiday' or 'something nice for the kids', to put it nicely ,is not a very prudent piece of advice, IMO. The fact you have an existing car loan suggests you don't have other financial resources to replace your car, or other high cost items, as they arise. So, what happens when the prize money is spent and you encounter such expenditure - another loan, paying interest? This is a double whammy i.e. you're paying interest rather than receiving interest on your money - a recipe for financial hardship. The kind of thinking which largely contributed to the Celtic Tiger credit disaster.
So, the prudent (some would say, boring) thing to do is to pay off the car loan and save the rest in a product which suits your needs, while trying to add a little to your lump sum via a regular savings habit. While this approach is not likely to make you rich, it is a recipe for financial security and piece of mind, which is 'priceless', to borrow a phrase!