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In Mauritius the currency of choice is the MUR, do not be taken in that Euros or dollars are widely accepted. They are not and if they are accepted by an establishment such as your hotel you will be given an unfavourable rate of exchange. This means you will have lost money.
Do not change money in your home country unless you want to get a lower exchange rate. The rate in Mauritius is much better. When you arrive at the airport in Mauritius you will see a host of exchange bureaus at the arrival halls. Just bring your own currency and change it over there for a better deal.