I think that a .357 or .44mag revolver would offer you a lot of flexibility as well as ease of carry. With either of these two versatile rounds you could actually carry 4 different types of round with you such as with the .357mag you could take along shot shells (small game), .38spl (small game), .357mag (med/lg game and personal protection), .357mag Buffalo Bore (lg game & Bigfoot protection). The .44mag offer similar versatility with the various .44spl / .44mag rounds. The ammo doesn't weigh a lot so you could pack an assortment.
I am a fan of Ruger handguns so my personal choice would be a GP100 or Redhawk with a 4 in barrel OR a Blackhawk if I was in a SA mood. I would favor a chest rig for carry either.
Sounds like a enjoyable and educational trip. Be safe.