Missing for a week

On a very last minute trip to Chicago. We (me and my brother) drove from California...left Wednesday and got there Friday. And I'll be coming back next Saturday!

He's here for his med school rotations so I'll be doing the tourist thing by myself while he goes apartment hunting...and since it was so last minute I didn't get a chance to see what to do! Please hope I don't get lost! I'm directionally challenged... xD