Chicago Next Week

I've talked to a few people one on one, but figured I'd do a general post...

I'm leaving Sunday for a week in Chicago (well actually Elgin)  (for business)
I've been there before, but this time we're doing a night in downtown Chicago.

Any suggestions for things we must see?

YOU NAME IT.. What do you want to see???

I remembered there was a Dick's there.... I'm excited to hit that place up!
I wouldnt mind going to the top of the Han**** Tower... Can you do that?

Any suggestions for dinner?   I think we're doing sushi one night and some place in greek town another night (no clue what that is)

I'll have a few nights solo... I think I might venture out via the Elgin station and see where it takes me.