Fuji-Hakone-Izu National Park
2-3hr train ride from Shinjuku Station (depending on the exact area)
Bordering Kanagawa, Shizuoka, Yamanashi and Tokyo, the Fuji-Hakone-Izu National Park is so huge you need to plan your trip wisely. You could see Mt Fuji while cycling around the park’s five lakes, or relax in Hakone’s natural hot spring baths after exploring the volcanic landscape of Owakudani. Prefer the sea? The Izu Peninsula is home to white-sand beaches and fresh seafood restaurants. If you have time, venture even further afield to the Izu Islands for snorkelling and scuba diving. There, that’s your entire holiday sorted.