a little "trouble". I wanted to take a photo of the delivery guy and she kept posing in front of the bicycle

.
Most of the time there is no issue taking photos, but of course one still uses common sense and respect. Certain parts of the city would be exceptions. In some of the night spots, it's okay to be in your face, but some parts of Shinjuku I would think twice before even taking my camera out of the bag... some people definately do not want their actions recorded and would have no problem making that your problem.
I take dry heat anytime over humidity...
Casey