Outside the Compound

Hint: Should I do anything at the landing pad?

Hint: How do I get past the guns?

Hint: Is there any way to jump across the cubes in the water?

Nested hint: How do I beat the marine in the dropship?
(sorry, cannot decode section)
Hint: I'm trapped! How do I get off the island with the ship!

Hint: How do I open the door in the tunnel?