Atago-jinja is a sacred site where spiritual souls meet to pray. You can do the same, or simply observe others as they worship.
If you've got time to stop for a while in Minato, Atago-jinja is a fine place to kick off your exploring. This sacred place is one of many attractions that'll keep you on the go here. Tokyo Skytree, Tokyo Tower, and Tokyo Imperial Palace are also ready to be explored nearby.