Paying off credit card debt is another good way to use your tax refund. Even if you pay off some and invest the rest, you've done a good thing financially. But don't only pay the interest; pay off the principal too. Or if you are still paying off a mortgage, then adding the tax refund to the payments is being smart.
Other things to do with your tax refund include servicing the car or increasing equity in your home by doing some kind of renovation, putting it away in a term deposit, or saving it in an electronic account with high interest. However, if you never have much fun in life, maybe you could spend some of it on a night out and create a happy memory that will rejuvenate you for the year ahead.
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