Do not change money in your home country!  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. Change your money there.

Just bring your own currency and change it over there.
 
You can change all international currencys: like Euro ,  American dollar and Sterling.
 
Credit Cards-       American Express is not widely accepted in shops and restaurants although Mastercard and Visa are.

In banks, you can change or get money from an automat, with

* cash money
* Travellerchecks
* bank card with maestro sign and secret number  (PIN)
* credit card with secret number  (PIN)

ATMs are plentiful and easy to use.
But some banks charge a fee to process cash withdrawn from ATMs. Depends on the bank. Check first with your bank to see it they charge a fee.