Maybe this would work for you? It's a hiking sim in the Rockies inspired by A Short Hike .. I think I abandoned it before getting any sort of gamification/objectives added :) It just came about because I found some surprisingly high resolution elevation data.
Edit: Just went back and replayed, forgot about the stamina mechanic. You need to end the hike when the bar is in the green to gain more stamina for the next day (either by hitting E at the "car" or Q)
I actually love the stamina mechanic because it imposes a limitation: you can't just chart out the entire space in one go. You have to pick and choose where you want to explore next, and you're always left wondering what else might lie beyond. You have to value every trek. And even at the maximum (I think I got roughly as far as it's possible to get along the valley by optimizing my path...), you still can't see the whole thing. I thought I caught a glimpse of a cabin just beyond the treeline. Realistically there's probably nothing there, but I'm going to choose to believe there is something more just out of reach.
https://partlyatomic.itch.io/joy-of-hiking?secret=msqgiZefzz...
Edit: Just went back and replayed, forgot about the stamina mechanic. You need to end the hike when the bar is in the green to gain more stamina for the next day (either by hitting E at the "car" or Q)
Various in dev screenshots here: https://imgur.com/a/jrO6iYd