I've shot a variety of formats and have some thoughts. I love my Chamonix 045n, but it can take 15-20 minutes to get a shot off. It's also harder to find a place to process the film. Color film for it is getting expensive. It's not heavy, but the set up time will definitely slow you down. Probably the very best bang for the buck is a Bronica ETRSi, a 645 body with mirror lock. It's compact, quick to use, and 120 film is in good supply. THe Bronica lenses are excellent. It all makes for a camera as fast to set up and use as a 35mm, with about 2.5 times as big a negative. I used one back in the 90s to give me an advantage in stock photo sales. A Bronica ETRSi with 40mm, 75mm, and 150mm is what I'd suggest. I too like to hike and am an avid outdoor photographer.
Kent in SD