Miho Shrine is a holy site where spiritual souls come together to pray. You can do the same, or simply observe others in worship.
You're spoiled for sightseeing choice in Shimizu Ward. Miho Shrine is a great place to begin here, but there are plenty of other worthy sights to enjoy. Chibi Maruko-chan Land, Nihondaira Observation Deck, and S-Pulse Dream Plaza are near the sacred place and will top off your day nicely.