Hi, I can't help regards your question about the wind conditions.
Talking money, it won't matter which currency you take wit you, as they convert each currency against the current rate. If you have a bank-card with the maestro sign on it, you will find it more preferrable to use it to collect money from the moneyteller machines, which clearly is the best deal for you. There are enough teller machines spread over he island, the first one can be found outside the airport and there are lots of them in Grand Baie.
Immer wieder gerne auf Mauritius und im Meer darunter ;-))