It makes no sense to speak a lot and especially to paint this topic, because everything is quite simple and clear here. Since the island of Colon, which is the largest and most significant on the Bocas del Toro archipelago, belongs to Panama (like the entire archipelago), therefore the current financial system is one. That is, in all cash calculations used U.S. dollar and Panama currency Balboa.
This fact automatically relieves the question of which currency is worth come to rest or on other cases, in Panama and, in particular, to the island of Colon. In addition to cash payments for purchased goods or services, it is possible to pay through plastic bank cards that support the basic payment systems ( American express, Maestro., Mastercard, Visa. etc). But this does not mean that in the presence of a bank card, you will not need cash. Not always and everywhere will be taken to pay the map. Especially if you do not find yourself in the city of Bocas-Town, but beyond, in another part of the island. In a word, the era of 100% non-cash settlements has not yet come.
You can use banking services or withdraw cash with the help of an ATM, in the capital of the archipelago, the city of Bocas-Town, which is just located on the island of Colon. Address National Bank Panama following; Ave. E Norte, Bocas Del Toro 507 . Immediately, on the next corner street, Calle 4ta. , The end of the building is located and an ATM, working around the clock.
As for Russian rubles, they are unlikely to use you. Exchange them if it turns out, then only in the capital of the country.
Here is the information I wanted to bring to your attention. It is possible that it will be useful for you in the future, if you are going to visit Panama, and specifically the island of Colon.