Though rain forests are very dense in vegetation, adventurers find it easy to walkthrough rainforests .Why is it so?

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Although rainforest are very dense forest compared to other forest, but the plant types here grow at required distance from each other so that they get proper supply of light, nutrients and space to grow. These forest have a layering system or stratification system for plants growing upto different height. The distinct stratification is found in the tropical rain forests into four or five  layers:  Emergent layer, Canopy of tall evergreen trees, Young trees, Shrub layer and ground layer.
So, in that way, adventurers get proper space to walk in such dense tropical forests.