this is really neat. if you want to put landscaping while using an elevated path (since plants are not able to be put on elevated paths, here's what to do:
1. first, build a path with a hole in it about 2 squares by 2 squares. it can be larger if you want.
2. then, inside the newly built hole, make a hill as tall as you can (it usually levels out with the path. if not, use the flatten terrain tool.) and cover it with whatever terrain you like.
3. now all you have to do is add trees, rocks etc. etc...
i'll try to get pics out soon.