Yes, a day trip from Tokyo to Mt. Fuji is one of the most popular excursions in 2026 and is very feasible with proper planning. The most efficient way is taking the Fuji Excursion limited express train from Shinjuku, which goes directly to Kawaguchiko in about 2 hours. Alternatively, many travelers choose organized bus tours that depart from Shinjuku or Tokyo Station; these often include stops at the Mt. Fuji 5th Station, the Chureito Pagoda, and the Hakone Ropeway for a diverse itinerary. If you travel independently, you can spend the day exploring the Fuji Five Lakes area, taking a boat cruise on Lake Kawaguchi, or visiting the Oshino Hakkai springs. Keep in mind that visibility is the biggest variable—winter (December–February) offers the highest chance of a clear view of the peak, while summer often brings clouds. If you leave by 7:30 AM, you can easily enjoy a full 8–10 hours in the shadow of the mountain and return to Tokyo by dinner time. For those with a JR Pass, taking the Shinkansen to Mishima or Odawara is another fast option to reach the southern base.