Not all who intend to stay at shelters actually make it, and those who arrive late sometimes find they can't sleep in the shelter. Besides, I don't like to have someone snoring in my ear and mice crawling over my head, and, since I snore, I don't want to impose that on anyone else. Tarp, tent, or hammock. Use shelters only as a last resort or kitchen for meals. Visiting in a shelter can be rewarding, but I like the option to sneak off to my hammock when I've had enough (which gets earlier every year lately).