I'm going to turn down free hockey game tickets from my brothers and instead play Dungeons and Dragons.
Why are you going to turn down free tickets?
I'm not really into hockey so I'd rather play Dungeons and Dragons with my brother.
While you should always be appreciative towards people giving you gifts, it is sometimes unavoidable that the gift isn't a good fit for you. If you think that other people would enjoy the hockey game more than you, it is acceptable to turn down those tickets gifted to you. As long as you do it respectfully and tactfully, your brothers will understand and not hold it against you.
Do you know anyone who might want to go?
Well they might wonder if you are playing with them and not at the game that something is wrong. Do you think you could take them with you and make it a family event?