Going out with your kids. how do they act?

My 17 month old always been great except for a few months now. We went to the mall today and she kept crying and whining the whole time from the car into the mall and waljing around. me & my bf made all these plans for the summer and I knew it wouldn't be easy but I'm worried she will be uncontrollable. Even trying to hug her and console her is no help /: we also have a 8 week old. He's been good to us so far. any tips? do you just "deal" with it?