Easy Rider conveys one of the best feelings in the world - freedom, just being out there without big thoughts in the mind.
And that's why Hopper and Fonder just get started on their machines. Without thinking too much. And catch a picture of the US, which is equally desirable and scary.
Or, as the film puts it: "You know, this used to be a helluva good country. I can't understand what's gone wrong with it." The question is, however, what has gone wrong since then. And, luckily, right too.