If you play golf. Messaieed GC has a pool and it's QP and so subsidised.
The RAA Beach & Boat Club (QP)
Dukhan Boat & Beach Club (QP and much better that RAA) but 85k away.
There is also a SS social club in Dukhan but again it's 85k away.
Many more hotel associated clubs have sprung up since I left.
We belonged to the Ramada Cabana for a number of years