Take Glen up on his generous offer, give him a call, he's the guru of south American travel, and he's been around the world on his bike. Check out his thread Striking Viking Bumming the World on this forum, if you haven't seen it already.
Whatever Glen tells you, accept it as gospel and follow his advice. Read his book too: Two Wheels Through Terror. It has a lot of tips about travel through the areas you're going through.
Also, the title of your thread doesn't really reflect the greatness of this adventure.. if you'd like me to change it to something more eye catching, let me know.
Does your wife speak Spanish? That would come in handy.
Hi Conchita!! You lucky gal!! Take lots of pics!!