Quiet Shinto shrine near Akasaka with a lovely approach and city views; generally open early morning to late afternoon (approx 6:00–16:00), so arrive early.
Walk around Kabukicho and Shinjuku East side; see the Godzilla head on Toho Building and quirky billboards, then explore Omoide Yokocho's narrow alleys.
Ride the ropeway with views of volcanic vents and Mt Fuji (if visible). Owakudani may have restricted access depending on volcanic activity — check status before visiting.
Take Fujikyu Railway to Otsuki, then JR/limited express back to Tokyo (Shinjuku or Tokyo) — allow time for transfers; this is a long transit day to reach Nikko afterward.
From Tokyo/Ueno take JR or Tobu Railway direct services to Nikko; Tobu offers direct limited express from Asakusa if you prefer. Check timetables in advance.
Large multi-themed onsen complex with international-style baths — a fun, relaxing way to experience Japanese bathing culture in the city (check gender-separated times and rules).