Hakone free pass for 4 days?

Is there a Hakone free pass that includes four days? We are traveling to Hakone from the Shinjiku station in tokyo,and staying there for four days.We will then travel from Hakone back to Shinjiku station. Is there a free round pass for four days?

We also might plan rent a car,what are the pro and cons of driving a car or taking the train? (We are a family of four with two kids and we will be taking four luggages with us.)

Thanks.

passes are only 2 or 3 days. that is all you'll need in Hakone. you will not need a car.

if you haven't already booked your hotel. i'd suggest change one hakone night for a tokyo night.