A few months ago when I was brand new to geocaching, I went out by myself into a vast, heavily wooded area (surrounded by basically ghost towns) that I was 100% unfamiliar with. There were no trails and I was bushwhacking the whole way. Got hopelessly lost, GPS died eventually. Thought I was going to die too.
On another occasion, I climbed a rock "wall" that was about 70 feet high at a 90 degree angle without any climbing equipment. When I reached the top, I realized that there was a narrow path going around it I could have used instead