If you’re going for a good long ride, the kind of ride that crosses state boundaries, you need to know the law before you go. Helmet laws are just the tip of the iceberg. There are laws around licensing, fuel, tolls, etc. While there is no reason to become a biker lawyer, you could be aware before you get yourself into a mess you wish you hadn’t.
This graphic and information regarding helmet laws is from http://www.bikersrights.com Their site is packed full of legal information about bikers, for bikers, and against bikers. Helmet laws vary by state. http://www.bikersrights.com/states/50state.html
Know the law before you go.