Yes, Mount Fuji and the surrounding Five Lakes region (notably Lake Kawaguchiko) is one of the most popular day trips from Tokyo in 2026. The journey typically takes between 2 and 2.5 hours each way by bus or train, making it feasible to depart in the early morning and return by late evening. Many travelers opt for the direct "Fuji Excursion" limited express train from Shinjuku or organized coach tours that combine Fuji with nearby Hakone. However, visibility is the biggest "wildcard"; Mount Fuji is notoriously shy and often obscured by clouds, especially in the afternoon. For the best chance of a clear view, an early start is essential. While a day trip covers the highlights—like the Chureito Pagoda or the 5th Station—those wishing to climb the mountain during the summer season or explore the region's hot springs (onsen) more deeply may find an overnight stay more rewarding to avoid spending five hours of their day in transit.