Basically, how you can benefit by using this pass is;
take a sightseeing boat(between Amanohashidate(via Miyazu) and Ine) and take a bus at least 3times in a day.
Price:2000yen
Valid one day when you purchased.
With the pass, you can ride on the public buses+Gurutan bus as many time as you want in a day and one-way ride of the sightseeing boat(doesn't matter you take from Ine or Amanohashidate or Miyazu).
You can purchase at Amanohashidate Tourist Office(inside of Amanohashidate station) or each pier(Amanohashidate, Miyazu, Ine).
*This pass is only sold seasonaly. Weekends&public holidays from 2nd Aug 2014 to 26th Oct 2014.*