How about adding schools as a rare building for towns? It seems kind of odd that there isn’t be any around. There are already professions where you start out as a gym teacher, football player, so on, which makes it seem odder to me.
It could be a large building with a football field nearby (with a sports equipment locker), where inside there would be classrooms with books and various misc items, a cafeteria with a large amount of food, a nurses office for medical supplies. There could even be smaller rooms such as a janitor’s closet with mops and chemicals, or a teacher’s lounge. The danger from exploring the building would come from the large crowds of zombie children, along with the regular spawn pool.
It seems like it could be an interest place to explore once you can deal with hordes of enemies, and would spice up the general town by making it seem more natural looking. I think it would be harder to work in other kinds of higher education schools just because there isn’t really a default enemy that would work theme-wise for the area. Not as well as the zombie kids at least!