Hey Louanna!
Maybe some word games would be fun? Or maybe you feel too 'adult' for that?

I remember some games in school when I was starting with German, games we call 'kalambury': you write some words in foreign language (nouns, verbs, not too easy of course

) on small pieces of paper and divide people into two teams. Then someone from every team draw one of the piece of paper and his/her task is to draw a picture showing thing that was written on that paper or try to describe it without using word written (of course even in your native language). The team get the point if they guess what was written on that paper. It was really fun, but of course such games are good only if people know this language at least a bit!
I agree with Thomas, watching films is also a great thing to pick up some words and have fun at the same time! Maybe watching American films with Polish subtitles would also be nice and challenging? I thing it's better than reading books which can be not so interesting and 'stimulating', especially at the beginning of learning Polish.
Dances and folklore are perfect in my opinion but it needs more effort, don't you think? But if you live in Chicago or nearby, finding some Polish folklore bands or dancers probably wouldn't be so difficult!

Maybe you could find some Polish people working in more organised groups (and interested in 'sharing' of Polish culture) near your place of living and try to invite them to your school?
I don't know, hmm, it's not so easy, but that is really great that you came up with such idea!
Warm greetings,
Lil'Me