When Ruby ran a restaurant on The Manitoulin, the Tourist Association put out “The Haweater 3-Dollar Bill”. It was valid currency in most businesses, as well as every bank and credit union on the island.
She doesn’t think it’s still in circulation now, but I think it was a really cool idea to keep visitors coming back. Ruby says it was mostly the tourists that actually used the bill for currency (and most she had to convince that yes, it really was a valid currency). She thinks most of the tourists likely took it home as a souvenir, rather than spend it. Business owners put any they took in promptly into their deposit bags, and the locals never bothered to use it much, if at all.