When I was doing my middle year back in the dark ages, I worked at a Botanical Garden in London. Six weeks of my 'year' was spent collecting Bromeliads and ferns in South America. Great place, been back a few times. Columbia, Patagonia, Argentinia, Peru, Panama, Chile, Belize, Guatemala et al. I have stood and looked at the Darien from both sides and flown over part of it; read the books, got the maps, checked out the CIA website. Scares the poo out of me! But I would be up for it.