Most Westerners receive a 90-day visa-exempt stay. Private islands, often in the Seto Inland Sea or near Okinawa, are accessed by local ferry or priva... Read Morete boat charter. The "Minpaku" (Private Lodging) Law allows short-term rentals for up to 180 days per year; properties must be registered with a visible license number. A 10% Consumption Tax is standard. Travelers should carry cash (Yen), as many small island docks and local markets do not accept international credit cards. Read Less