An average day is basically going to the place you're supposed to go, show the products you have to show, make a couple of sales, fill your activity report, pack your stuff and go back home. Great pay. Since you travel a lot, you meet different people so it's rarely boring.
They can send you very far sometimes, though. I wouldn't recommend taking that job if you don't have much driving experience, especially on highways. But if you do, go ahead!