For extra non-suspicious levels you can also play pokemon go. Then you can keep your phone on hand and in weird angles for taking pictures and if someone happens to look or ask why even with the dog with you, you can just show it on screen, “oh sorry, I’m just playing pokemon” (they likely don’t know how it works anyway)

The trick is to have a dog. You can walk anywhere, at any time, and people won’t even notice you or will just take one glance and think, ahh, just someone walking their dog, nothing suspicious or weird about that