One of my favorite things about riding is the lack of agenda it usually has. I see roads that, when I've been in the car, I've asked myself, "I wonder where that road goes?" When I am riding, I get to answer that question. It just never seems worth it to explore in the cage in the same that it does on two wheels.
Similarly, I stop to take a look at things a lot when I am riding. I never even think to do that when I am in the car, much less do it.