Typing “meditation” into wikipedia you will find that one definition is:

“…effortlessly sustained single-pointed concentration meant to enable its practitioner to enjoy an indestructible sense of well being while engaging in any life activity.”

Riding a motorcycle through a foreign land for hours on end can be a meditation. The more challenging the riding conditions, the more one is forced to focus on the task at hand until most extraneous thoughts are eliminated. You can become so absorbed in riding fast along a twisty mountain road on a sunny day that you may not realize that you are smiling until the road straightens out many miles later. Sort of like a moto nirvana.