Allinfun, you just described our Yorkies perfectly!  I'm reading all these posts wishing I could take ours, or at least one of them, shopping with me but they would bark and jump and have way more fun than they should.  
 
One day I took our biggest Yorkie, FiFi, on a short shopping trip.  She had never been to PetCo and she had a blast!  Then we went to Subway and I brought a sandwich to the car that we shared.  We had "girl day"!!!