Expat Clubs (Nairobi)

Hi,

Are many expats in Nairobi members of any nice sports/social clubs? I'd like to join a club where I can swim, use a gym, maybe play tennis, as well as meet others.

It has to be some where relaxing where I would want to spend the day with a book and have lunch too if I fancied it! I went to the Impala club once and I was not a huge fan... I don't mind splashing out for somewhere smart. Thanks! :) Kate