Download Forest Pack FREE Unity.
Unity 5 compatible forest assets
Package contains:
– Four trees (with wind bending and capsule collision)
– Two small trees
– Six stones/rocks
– Two branches
– Three logs
– Fern
– Seven ground plants
– Two tree stubs
27 Objects total
– Demo scene included
Looks good in combination with the mountain creek package
Check out the details this from the Unity Asset Store: https://assetstore.unity.com/packages/forest-pack/forest-pack-29826