I knew a couple of people who did 7 Summits, though you need time off in winter (Vinson, Aconcagua, Australia). What you then can convey to your students!
Limited to then the Northern hemisphere, that'll be Europe, much of Asia, and way out West for us here. So, then the Alps, Himalaya, odd other peaks, and right here, the Cascades, Rockies, and Sierra. With as much time off as teachers get, maybe doing the Cascade volcanoes, CO 14'ers, CA 14'ers, whatever list achievement, etc. Beautiful by me, and many here. Multiple road trips with peaks, Heaven on Earth by me!