This mega mod  gives nicer , dense milky white clouds that drop to cover the mountains. crazy AI drivers. Full sky with all the planes available, more cars on the roads, more birds, fish and insects. Sam´s fire in pairs of 4, nice summer sky, and a denser night sky.Rico runs faster.This mega mod enhances the game without making it absurdly unrealistic(at least for me)

This is a combination of mods made by others credits in the file.

Video:

http://www.youtube.com/watch?v=vV9urTrJxMQ