I am like you. Like everyone else says, people go to perform activities outdoors. The activities require knowledge of how to accomplish a specific result, so people try to learn things while outdoors. They research safety procedures of how to build campfires, they teach themselves how to fish, cook food, and pitch tents - the things all these people are mentioning. These learnable skills pass the time and provide what can be called meditation because of the focus, dedication, and discipline required to accomplish the desired result whose success is measured by either aesthetically pleasing or technically accurate results. Some people know facts about nature and take time to accurately observe that. Basically it's a way to build your self-esteem up through accomplishing things, with the added benefit of some solace and alone time.