I wouldn't recommend a big expensive DSLR unless you're a photographer first and your Expedition is a secondary concern. The number one thing you want is something convenient enough that you want to use it, it can't be a burden added onto your already existing burden. After you figure that out, just about anything in the last 5 years is pretty good, recent improvements in sensor technology is pretty amazing.
High end compacts like the Sony RX100 series are great (I loved my RX100 mk3 till it fell out of my pocket onto slickrock at Alstrom Point), it might be worth looking into a ruggedized compact like the Olympus TG5 too.
My secondary/Backup camera (Panasonic GM5) has quickly taken over all the casual photo duties when I'm camping and hiking. It all packs up into a small easy to carry bag I can put on my belt. The weight is so small that adding it to a day pack is no problem. And it's versatile enough that I can use it for most photography in a pinch. The only time I have to haul out the heavy main camera is when I'm doing serious photography and all other considerations are secondary.
Believe me, convenience and comfort to use is the most important thing. The best spec camera in the world is useless if you never take it out and use it.