Senso-ji 浅草寺
Tokyo's oldest temple (founded 645) and the single most unavoidable first-timer sight. By 10:00 the Nakamise approach is a slow-moving crowd; before 08:00 it is close to empty, the shutters are still down showing their painted Edo scenes, and the Kaminarimon lantern, Hozomon gate and five-storey pagoda are a quiet 20-minute loop. Grounds are open around the clock, so an early start costs nothing.
Tip: Go before 08:00. Main hall opens 06:00 (06:30 Oct-Mar) and closes 17:00; grounds always open. Sunday 14 Mar will be worst - do this on a weekday. Combine with Kappabashi in the same morning.