What do I wear for this?

I'm hanging out with this guy I've been talking to for a while now. I live near a park so he's meeting me there. I was thinking of bringing my basketball to shoot hoops while I wait for him.. but what do I wear? I don't wanna look like I'm trying too hard ( but I am ) and I don't wanna look like a slob. My style is Hollister, very summery. What should I wear? :-) No silly answers please.