(Horizontal image) DISNEY AMBASSADOR HOTEL ® , lettering in rectangular box, © DISNEY, no border, very simple design.
This coin has been reported as a "nickel" as well as "penny". Samples are scarce. Never known to have been onstage at Tokyo Disneyland Resort.

(Vertical image) DISNEY AMBASSADOR HOTEL ® , Bellhop Mickey Mouse head facing right, aircraft above Mickey’s head, © DISNEY, dot border.
This coin has been reported as a "nickel" as well as "penny". Samples are scarce. Never known to have been onstage at Tokyo Disneyland Resort.

(Horizontal image) DISNEY AMBASSADOR HOTEL ® , Bellhop Mickey Mouse with luggage on left, streamlined 1930’s Dryefus style steam engine on right, © Disney, dot border.
This coin has been reported as a "nickel" as well as "penny". Samples are scarce. Never known to have been onstage at Tokyo Disneyland Resort.

(Vertical image) CAST MEMBER EXCLUSIVE, Mickey with Disneyland castle in the background, © DISNEY, partial border.
Based on reports from Kuniaki Hiraki's Cast Member friends in Japan, this was one of the first two Tokyo Disneyland Cast Member Exclusive pressed pennies ever offered. Issued in early in October of 2011, via a single die penny press, kept backstage in a Cast Member Shop near Tokyo DisneySea and not accessible to regular guests of the park. A second Cast Member Exclusive coin, Oswald TCM0002, was offered at the same time in another single die penny press at a Cast Member only shop near Tokyo Disneyland.

(Vertical image) CAST MEMBER EXCLUSIVE, Oswald the Rabbit with Disneyland castle in the background, © DISNEY, partial border.
Based on reports from Kuniaki Hiraki's Cast Member friends in Japan, this was one of the first two Tokyo Disneyland Cast Member Exclusive pressed pennies ever offered. Issued in early in October of 2011, via a single die penny press, kept backstage in a Cast Member only shop near Tokyo Disneyland and not accessible to regular guests of the park. A second Cast Member Exclusive coin, Mickey TCM0001, was offered at the same time in another single die penny press at a Cast Member only shop near Tokyo DisneySea.

This information about the coins shown above is from a friend of the hobby in Japan.

"The skull island coin says "Look for the skull by the water."

"The Flag coin says "Read the writing on the lighted room."

Captain Hook's Treasure Hunt was a special attraction exclusive to those staying in the Peter Pan Room at Disneyland Hotel during a limited period of time (some time between January and March in 2012 and 2013).
According to this blog, as soon as you enter the room, you'll find a locked treasure box with an instruction sheet at the bedside. Click to see photos of the room:
http://blog.livedoor.jp/kao2dis/archives/23333211.html . (A translation option will appear with some browsers.)
At the front desk, they'll hand you a crossword puzzle. Then you go around all over the hotel searching for answers. They let you know the whole thing will take about 2 hours to solve. When you solve the crossword puzzle, you'll come up with the numbers to unlock the combination lock on the treasure box by your bedside. Inside the treasure box, you'll find a plain coin and an instruction telling you to go to a certain place to flatten it. There you'll find a blank EC machine, and when you stick the coin into the slot, it comes out flattened as the skull coin with the last clue. Check this blog for pictures:
https://kazuemon.blog.so-net.ne.jp/2012-03-02 . (A translation option will appear with some browsers.)"

A additional translation from our friend in Japan:

"Anyway, so these coins are a part of the clues to solve the treasure hunt mystery.
It must be super rare because the whole thing took about 2 hours. I'm sure most people are too tired to do anything else after spending the whole day at Disneyland and Sea.
Plus it was limited to 1 coin per room, no matter how many people were participating in the treasure hunt. They also said that it was pretty difficult, and I've seen some blogs explaining about how they failed or ran out of time and gave up. According to the instructions, they forbid you to do any treasure hunting from 10 P.M. to 8 A.M. in order to avoid any complaints from other guests staying in the hotel."