What about a Fuji GA645W ?
Cheap, rangefinder camera which means compact (for MF) and light with amazing 45mm f/4 wideangle (leagues above the SLR wides).
Being 645 means more shots per roll, which would be good for hiking.
Also, integrated lightmeter (and aperture priority) and quartz timed shutter, which means great accuracy (compared to mechanical ones) for slides.
It's motorized and autofocus, but during hiking I doubt the sound will disturb anyone.