What day is best to go without too many crowds. We don't like to go with too many people too crowding

Honestly the weekdays. Mon-thurs

I would also recommend arriving 30 to 45 minutes before opening to get a good shot in the covid screening line and first into the zoo.

I would agree any weekday. Make sure to make a reservation. Also walk to the top and work your way forward making it less crowded. Even some of the exhibits have it only in one direction making it less of a crowd.

You need a reservation now, which helps cut down on the crowds, plus the zoo is already at reduced capacity due to covid. Pretty much any weekend day, not a holiday, is low volume