Riverland Sport Club - Tamarin, Mauritius

I regularly come to Mauritius about 3 to 4 times per year and normally stay for about 3 weeks at a time. Whenever I come I normally stay in a apartment near Ruisseau Creole (Tamarin). I am looking for a local Gym to go about twice per week during my stay. I am wondering if I could join your club during my stay in Mauritius and if this possible can you give me an indication of the cost. My next visit to Mauritius will be on 14th June 2015.
A response before this date will be very much appreciated.
Looking forward to hearing from you
Regards
Mike Choy