I dont know what to do for my boyfriend! i want it to be special?

He's 21, almost 22. He is... your typical guy. Likes video games. hanging out with the guys. Action movies, comic book movies, and just your basic guy. He works a full time job and I know it would mean a lot to him if I were to do something special for him just because. with no real reason, other than I love him. I want it, to be romantic and fun, but not cost a whole lot of money. Im not very experienced at the whole dating thing, especially older guys. Im only 17, almost 18. I could really use some help!