Saidai-ji is a Buddhist temple that adds a useful stop to the Okayama things-to-do map. Okayama temple best known for the famous naked festival held each winter. It is worth listing for travellers because it gives the destination a more specific texture than another general viewpoint or shopping street.
Plan it as a focused visit rather than a whole-day anchor unless you already know this is your special interest. Check the official site before going for current opening hours, tickets, and seasonal closures, then pair it with nearby sights in Okayama so the detour makes sense on foot, by transit, or by taxi.