[B]Stuck in the place where I get a gun to my Air boat![/B]

[Mr. Finland]

There's that big garage kind of door that won't open...help!

 

[oldagerocker]

get in the boat, the guy opens it for you as you drive off. If he doesn't, go back to an earlier save and try again, it's a bug.

 

[Mouldy Punk]

Type ai_disable 0 in console if it keeps happening, it enables the AI again.