In reply to Alan James - Rockfax:
I stayed here a few years ago in May and it was very quiet - also in August when it was busier but still plenty of space.
One incident sticks in my mind about my stay. There was a group of 4 bikers in Hell's Angels jackets who proved to be quiet and considerate of others - unlike an unruly family I once stayed next to.
One of the bikers had a big Harley three wheel conversion. Next door to them was an old couple in a campervan - the lady was disabled and used a mobility buggy to get around. The guy with the trike offered her a ride and they kitted her up with a helmet and went off round St Davids for a spin. She was really pleased with her trip and they shared a BBQ afterwards.
Another confirmation of the "Don't judge by looks" principle.