I figured it out on the spot, but had checked out a Thailand and Cambodia guide book beforehand… it was pretty straightforward. Once we got there, getting speedboats, taxis, and tuk-tuks was pretty easy too.
The prop plane was trickier… my brother in law is a commander in the French military and had been working as an adviser down there. We were there to visit him and he had set it all up for us
He recomended that corner of the country and it was interesting. That’s where they filmed Apocalypse now. It was thick thick jungle and the animalistic hill tribes that lopped the head off that water buffalo are real and live there (and really do that kind of stuff 
). If you think you might go up there, I know a good guest house - just PM me