I don't think ANY of the Dolphin/Swan pools are as hectic as the pools at the other hotels. While I would agree the lap pool is the least used, the Grotto pool never seems to be overrun....I frankly love the pools at the Dolphin. I am one of those people who gets all stressed out by people sloshing water on me walking by, dumping over my drink sitting right next to me, bumping against my chair, having their soppy butts in my face, watching screaming children running along the side of the pool begging for a fall and skinned knees at best - concussions and falling into the pool to drown at worst....
I found it very calm at the Dolphin....yep, there were people there - sometimes more and sometimes less - but it just wasn't a wild party and I never had to fight for a chair. I loved the Dolphin. I won't go anywhere else.