Well, for some reason, I bought this book a while back in a charity shop. Extreme Ironing! What a concept. People ironing out and about, be it up a mountain, coming down one (rock climbing or abseiling perhaps), cycling, dangling from a zipwire, in a tree, underwater!!!
So.... well, why not write letters out and about?
Sometimes, there are benches/tables to rest, admire the view and, well, for me, to pen a letter.
Sometimes, no bench, so have to park myself on the grass. I had a gilet I could sit on.
I made use of slate to sit on and to use as a table. This site now has UNESCO World Heritage status.
Not so extreme is sitting at a table in a beer garden with a nice drink to hit the spot!
I have had some people comment when they see me writing letters in cafes... I like to show people letter writing is still alive.