I'm more in the "wish I had my camera" category these days, but once upon a time, I took lots of portrait shots and have even had one in a juried show. I only took these portraits with permission, mainly because portraiture is a look not only at the subject, but into the world of the subject, and often shows some deeper emotional level than you'll get in a landscape shot. Depends on the subject, of course, but I'd feel really weird taking pictures of people without their permission, especially kids.
That said, my brother was stationed in South Korea a few years ago and he used to go out into the markets and sent me some really beautiful pictures of the people there. One of my favorites is two old men playing something that looks like checkers. I think it may be go, but I'm not familiar enough with that game to know the difference.
My favorite photography subject these days is my daughter. Luckily, she's a very agreeable subject.
Roxy
Getting in touch with my inner try-athlete.