Vietnam/Jungle

No submissions to post, I intend to create a Vietnam/Jungle theme type of map for one of my First Person Shooter maps and I am just wondering if anyone has any suggestions or recommendations of what I should make sure to have/do so it will look and feel like one other than the obvious lots of trees and grass. I also have started picking out some enviroment models throughout Hive but if anyone has any specific ones you might think would fit this kind of theme it would help out greatly.

I have created various small maps full of greenery but soon becomes an infestation of weeds and trees and doesnt have that Jungle feeling. Not sure where I am going wrong.

Thanks

Use a lot of vines/exotic flowers and shit like that. Huge trees also helps.

The swamp trees in the UTM would probably help.