Right before they're about to close. I'd say 2 hour beforehand give or take. And/Or also show up on weekdays when there is least traffic
About 2 h before closing time there are just a couple of people.
LA fitness has aqua classes on some mornings that start at 9. Classes at night are 6-7 Tuesday and Thursday at Imbrie and Monday and Wednesday at Hocken. You are more than welcome to join classes. Fun group and great instructors. Pools are used regularly for lap swimmers. Probably during mid day would be best.
After 8-9pm
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