Ok, I feel like an idiot. I've been stuck on the 2nd level for over 6 hours. I've scoured the net to look for a walk through but found nothing. I've done in order.
1. Catch up w/ Kade
2. Meet up w/ Kade at the old outpost
3. Destroyed the patrol boats.
4. destroyed the towers in the plantation.
and Now I can't get behind the wall/fence to find the C-4 and destroy the warehouse. I've tried everything I can think of. Shooting the ropes, ramming it w/ boats, pipe bombs, grenades. And I am now ready to throw the game out the window I am so frustrated. ANY help on passing this level would be GREATLY appreciated.
Thank you!

Well, I finally figured out that I was just overlooking a tiny little trail. But does anyone know of a website that has a walkthrough published on it?

there's a trail around it, on the other side of the island somewhere.

and when you get up there, go into the small building left of the big building you have to blow up and they are in there.