While the park is dominated by Mount Fuji, which is (in good weather) visible from all parts except the southernmost islands, the local landscape is in entirety volcanic. In particular, a number of the volcanoes on the Izu Islands are still active.
Flora and fauna
Routes vary widely depending on where exactly you're going, but it's safe to say that the most common starting point is Tokyo. Cities near the park include Odawara, Fuji, and Numazu.
The volcanic activity of the park means that there are hot springs galore. Those in Hakone are the easiest accessed from Tokyo, but the Izu Peninsula is also a popular weekend getaway.