VACATION20
Saw this deal on Slickdeals and have since made some bookings for Japan.
For example, this Mount Fuji deal is $183 in the AU store but only US$101 (A$146.91) after applying promo code.
Coupon code value: 20% off (minimum spend is $40)
Redemption Period: 00:01am PT, May 19, 2019, to May 30, 2019 23:59am PT.
Activity Period: The date of the activity booked must be between May 19, 2019 and December 31, 2019 (inclusive). Where the activity booked takes place over more than one day, the total duration of the activity must fall within these dates.