Have a look at the BBC Natural World documentary on the Jaguar - well worth an hour of your time:t: It is based around a couple of males that were translocated from an urban area to the Pantanel. It covers the hacking back of these 2 brothers into the semi-wild habitat and the gauchos positive...
An interesting area to explore that’s for sure. I presume you would intend this ‘Indiana Jones’ jaunt during the flood season? The only advice i would offer would to not visit Shit Creek without a paddle;)
Otherwise, good birding if you undertake (no pun intended;))