Repeat the mantra, folks: hints are in logical, sequential order here.

I'm stuck at the dock. How do I go anywhere without being shot?

I can't pry open the underwater grating.

How am I supposed to get the backpack up top?

How do I use the stuff in the backpack to escape?

I can't get past the ape in the second screen.

I'm past the ape, but how do I get up the waterfall?

How do I get rid of the guy guarding the plastic explosives?

So now that I've taken out both the guards and got the plastic explosives, what now?