There is a few that have tall trees, one of them is in this vid. Whether it is one way or not is entirely up to the pilot I guess.
The strips on average are 1000m long. Usually lose quite a bit to the floods.
Some are 800m and a rare few are 600m.
Landing length is not the issue. Its the performance on take off out of them that eats up the runway. You can see with the grass runway that I am barely clearing the end.
I think that was filmed around April/May so warm temps.
All of the runways have "escape" paths out of them, usually following a river or some such.