The obvious answer is "where ever you are going anyway" is the best place to daygame, and yeah I do go to places/events/meetup groups I enjoy but let's say I have a whole day off and I want to go somewhere specifically to daygame. Where are the best places?

Gas stations - Seems like girls are in a rush to get in/get out. Worth trying anyway I suppose but seems like asking to get shot down.

Grocery stores - Seems ideal, you can see how fast she's moving, mention something in her cart.

Shopping mall - Seems ok, except they're usually with their friends or parents, could be 16-17 years old, but if you notice a girl who's walking slow/seems like she has nowhere to be, that's a great target.

Library - Low population, and the "drawback" that I see is if a girl is sitting down and you sit down too, to game her, then it's harder to gauge interest/disinterest because in regular life they walk away when they're disinterested.

Clothing store - seems a little invasive because....I'm sure they'd think it's weird that you're walking around the women's section anyway.