GP
Yeah, another +1 to some type of K-frame, and I would prefer a .357 over a .38, not for the need for more power, but having it as an option. My GP load for some time in .357 has been a 158 LSWC at 1000 fps, hotter than .38, but certainly not full house mag either.
I have walked a lot of miles alongside revolvers, (documented 1000 one summer long ago in Shenandoah NP) and a K carries far easier than an L by a long shot. A Ruger Six series would be ideal also. I'd also opt for stainless, which is a bit more forgiving if you dunk it, sweat on it, or fail to wipe it down after a walkabout. There's something to be said for fixed sights too. An adjustable rear is nice, but somewhat vulnerable. A lot of tiny parts there, and a pretty thin leaf too. I trashed one over the course of about 15 yrs carrying revolvers and getting paid for it. Not abuse, just circumstances coming together to render a blow to the sight and .....busted leaf.
Thus I'm thinking a S&W 65 or a Ruger speed Six, both stainless as mentioned.
I wouldn't worry too much about having to shoot poisonous snakes when afield, although I will not tolerate them around my place or camp. I also am leery about meeting one in Spring Gobbler season before daylight, but my walking stick works pretty good for that if I intend to frequent a certain place before dawn. Otherwise they get a pass.