A few years ago, I did something similar, except, I flew from Canada to Europe and rented a car there. 4 weeks of fun and about 200 hours of video (back before I was into photography... lol).
It was an amazing experience. If I was to suggest anything, spend a little less time looking at/for pictures and a little more time seeing the beauty around me.
I was driving around and found myself in this little valley at the base of the Swiss Alps... it was breathtaking, I mean literally you stopped breathing to look all around you at the beauty. I almost missed that becuase I was filming!
Be street savvy... don't pick up hitch hikers and be wary of strangers checking you out a little more than normal. Don't carry a gun, that just gives them something more to use against you. Better to be pro-active and not fall into those situations beforehand, than reactive and try dealing with them when it is too late.
Enjoy, be safe and have fun!