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Been to the Caribbean a few times (you will love it) and going again in January
I have only ever used $US and have never seen euros quoted or used
Try to avoid the local dollars and if you pay in US insist on change in the same currency or you could be left holding the local notes which can be a problem
I have always found taxis reasonable but agree a price first
In some ports people carrier type taxis take tours to the sights usually for much less than the ships tours.
The only islands you may find the Euro in use are the French ones. We found it necessary to use Euros in Martinique but we did not request to pay in dollars so it may have been possible.
We paid in dollars in Martinique but got Euros for change. The Euro is their preffered choice,however most stores will take the dollar. In Dominica we went river tubing and the guides were asking us to change their dollar tips to sterling or euro's as it was worth more to them. All other Islands we visited used the US $.