I recommend getting a metal water bottle and carrying that around when you’re sightseeing or any activity that keeps you outside in the sun for long.

Also I personally never noticed any extra sweating when drinking cold water versus ambient temperature water, and I live in Portugal were we regularly get 40C or more in August. Generally, if it’s hot enough you’ll sweat more simply from the heat (as sweating is a natural cooling mechanism) even if all you drink is plain tap water. Sure, if you don’t drink water you’ll sweat less, as you’re getting dehydrated so the body will cut down on that.

Were did you learn that specific piece of information about cold water making people sweat more?

Avoid being out in the midday sun. If you do, try to walk in the shade as much as possible.

If your windows have external shades close them down when the sun is hitting that side of the house/appartment so that the heating up of objects from the sunlight happens outside not inside.

Wear shorts/skirts and loose clothes of thin textites that don’t retain much heat (such as cotton).

If you’re going to be out for long periods, bring water, ideally cold water.

Sure, if you have AC or, even better, a swiming pool, it’s a lot easier to keep cool, but these suggestions will work even for those who can’t afford those things.

It’s do with living in the moment vs spending your time thinking about what you did or worrying about what the future might bring, IMHO.

We become way more prone to spend our time doing things like thinking about stuff we did (and how we miss it if it was good or could’ve done it better if it was bad) and worrying about what the future can bring (and not necessarily in grand terms: somethingas simple as “I have to get a haircut” which then goes one to “when will I have the time”, then “but I need that time for X” and so on) as we grow older.

You absolutelly can still have some moments of wonder (for things as simple as how a cobweb looks with droplets of morning mist on it) but you need to be present there in mind also, not just in body, and not to not let some memory or concern rush in to take your mental attention away from the now.

I had a point in my life with a ton of anxiety and ended up learning Mindfulness (which is simply to try and not say anything to yourself in your mind, which is surprisingly hard to do for more than a few seconds) to stop the feeling (if you’re not constantly looking back to something bad or fearing for something bad in the future you don’t feel anxious about those things) and as a side effect I ended up with the habit of being more often present in the moment and that’s how you just enjoy little wonders when you come across them.

Still, it’s nowhere at the level one has as a kid.