You can travel to Shirakawa-go by public transport or rental car. From Tokyo, a one-way high-speed train costs 13,500, and a one-way transfer bus ticket from Kaetsun to Shirakawa-go costs 1800, for a total ride of 5 hours.
Mount Tarumae
Seeing as Mount Tarumae is not accessible by public transport directly, you must first go to Lake Shikotsu Visitor Center.