Stay out of the river. Had a dicey experience.
I think that depends on who your guide is. We too had a few words with some "locals" we ran into up there. Nothing really scary, no guns or anything like that, but I know just enough Spanish to follow that they were telling us to leave. So we left. Other guides from our group had fished up there everyday and nobody said a word to them. It may depend on who you know.
We did see a 1960's era ski boat go by with a big round bail of marijuana on the front deck. The guy driving was standing up in the driver's seat to see over it. He waived and was friendly. Lots of marijuana growing around the lake.
Wish I was going back tomorrow! Fishing is phenomenal!