First impressions
Two things come to mind: exciting and humid. Exciting, because there’s lots of interesting stuff to see and humid, because it’s, well, freaking warm and humid.
Like sit around, do nothing and sweat like crazy humid. — Not that I expected otherwise, but it’s even a little more extreme than I was anticipating.
Here’s one of the side streets off of Nathan Road:

And here’s Hong Kong Island seen from the Avenue of the Stars:

I am looking forward to exploring more of Hong Kong tomorrow!