The other people is saying that the best season to come here is in October, but they've wrong!
With me, you can come at any time.
Why do you like summer holiday in your country?.... And why don't you like to come here (even for few days or as long as you want) in December, January February and March?
You may think there might be possibility of "cyclones..."; but Mauritius, Reunion and all the neighbour islands still get their clients during this season!!!
Myself, I've leading several tours and I will continue again, not only from April to November but especially from December to March; Even birding is good and also all the plants and landscapes is green and amazing in this time of the year.
So, please just choose your personal guide and propose him the touristic place you want to visit.