A few memory chips fading hereabouts...only to be expected given the demographic I suppose
I was at Kinloss on and off from 77 to 03 and the wee pool (next to the gym) was open, functional and extremely well-used throughout. Some famous swimmer (Goodhew? Wilkie?) did an exhibition swim in it once. As I recall, if you volunteered for lifeguard, you got out of some station duties.
St Mawgan had no pool but had early morning time slots reserved at Newquay (indoor and outdoor) which was near Newquay zoo. I well remember swimming in the outdoor pool very early morning listening to the zoo's resident lion roaring. Mountbatten had no pool, so the survival school used the one at RNAS Culdrose (which I recall being a proper size) for its many drills.