Hi Kimmi,
finally we get to try to help you,you are always so helpful to others, especially newbies so here goes
Find out if u can from one of his friends who is favourite sports team are and then arrang two tickets to see them, in advance try to buy a team momento to wear when he goes to the bathroom in the morning of his birthday( my wife looked fantastic wearing a Scotland rugby top and nothing else!!! ). good luck on thinking up a great surprise