Go to JR Shinjuku Station. Transfer to the Highway Bus bound for Lake Yamanaka.
Get off at "Mount Fuji Lake Yamanaka" (Entrance to Hotel MountFuji).
Take the Shinkansen to Mishima Station. Transfer to the Highway Bus bound for Lake Yamanaka.
Via Tomei Expressway:
Shin-Gotemba IC → Higashi-Fuji-Goko Road → Yamanakako IC (3 min to pension).
Via Chuo Expressway:
Higashi-Fuji-Goko Road → Yamanakako IC (3 min to pension).