You have the possibility to practise
water skiing, sailing, diving.
You can also do pedalo or canoe
You have to pay for all these sports.

Some hotels around allow visitors to spend a whole day and to take
advantage of the different facilities (sports, swimming pool, etc)
for a som of +/- 10€ per person
Moreover, the entrance fee allow you to consume drink and food
hill exhaustion of you 10€

Mauritius is a paradise for beginner or experienced divers
There is a good diving school at Blue Bay