Even on a tight schedule, Sensō-ji & Asakusa earns the hours.
Allow 1.5–2 hrs.
The giant red lantern at Kaminarimon and the incense haze make it feel genuinely old-Tokyo, and it's free. The catch: Nakamise-dori is a tourist gauntlet and midday is shoulder-to-shoulder — come at dawn or after dark when it's lit and empty.