A 330-foot (1000 m) crescent seawall built in 1932 created the Children's Pool, which isn't a pool at all but a protected swimming space intended for the kiddies. Sea lions and harbor seals have also taken a liking to basking and birthing in the more tranquil waters, leading to talk about turning it into a marine mammal sanctuary. Swimmers can still use the beach but are discouraged from entering the water for health and safety reasons. The beach is closed to humans from December 15 to May 15 for harbor seal pupping season.

sandiego.com