Gather a bucket of rocks, sticks or other natural objects such as pine cones.
Find a spot where the ground is not too littered with debris, such as a trail that already exists.
You could just draw the markings in the dirt, if you have a trail with dry clear dirt. However, trail markers are fun to make because you can put them on paved trails. Also, if there is a light rain, the drawings might wash away, but the trail markers should stay clear.