Known in Japan as Fujisan, Mount Fuji rises to 3776m and is Japan's highest mountain. Almost perfectly conical the volcano has unsurprisingly perhaps been worshipped as a sacred mountain.
The last eruption of Mount Fuji was in 1708 and the volcano is now considered dormant and can be seen Tokyo and Yokohama on clear days, as well as – famously – from Hakone.
Perhaps the easiest way to see the mountain is from the train on a trip along the Tokaido Line between Tokyo and Osaka - take the shinkansen from Tokyo towards Osaka and the best view of Mount Fuji can be seen from around Shin-Fuji Station on the right hand side of the train, about 40 to 45 minutes after leaving Tokyo. Clouds are often a problem and visibility is best in winter months.
How about heading to Fujigoko or Hakone where there are also hot springs, or those that are feeling energetic could climb the mountain - Mount Fuji is officially open for climbing during July and August and there are several routes.