My wife and I are looking at going to Monterey, CA, USA over a week long furlough from my job in early January. It is approximately a nine hour drive from our home in Phoenix, AZ, USA to my aunt's home in Visalia, CA, then another three hours to Monterey. Our son will be approximately three months old by that point.
What are some things we can do to keep our baby happy and us sane over the long trip?