Convo topics and stores guys like to go to?

Well next week my best guy friend—who I have a humongous crush on—and I are hanging out at the mall. It's never really been just the 2 of us, and I would invite my other friend to hang with us, but (i know this sounds shallow...) I don't want her to take any attention away from me...and also he said he wanted to hang with me. Anyway, i know I'll be fine once we get a conversation going...but I need things to talk about...and to fill those empty pauses between subjects. Also what stores can we go to? I live in SoCal, so I'm thinking spencers, hot topic, h&m, and the food court but idk where else we can go...so any ideas for convo and stores would be appreciated. Thank you!