I'd be careful to say what it can do for your mental health. I tried to make it work for me, but it always made me feel worse because it gave my mind time to ruminate on bad memories and feelings. I would've stopped doing that to myself sooner had I not heard that exercise = good feelings without caveats.
It's not for everyone (as noted by that other commenter), but when I was in a bad place mentally, I was listening to a podcast and one of the guys said that whenever he was in a really tough situation, he'd go for a 30 minute walk before making any decisions and then when he'd had time to consider everything, he'd often have some idea where to get started fixing things. So I started going on walks listening to that exact podcast. Helped a lot. It's a double whammy, too. Not only do you have time to yourself where you can think about things (in my case while listening to the podcast because I have ADHD and just my own thoughts all at once are a bit too much, but when I'm also listening to something, I get less of it), you also get the happy hormones from physical exercise and fresh air.
Good on him for taking a hike. The first photo trips me up. Was the hike to the middle of a highway? Is there a placard or historical marker there in the middle of the highway?
I'd guess that was at the trailhead or right outside the trailhead of the trail he went hiking on. A lot of the trailheads I've seen on the pacific coast are like literally 10ft from the highway