This is a video of what you can explore with mediocre skills in this portion of Plains of Ashford with improper jumping/exploring abilities.
A guide on how to actually get out of the playable area is shown at the tail end of the video.
What you need:
Keyboard
Mouse
GW2
A trait that reduces fall damage - Just in case!
Follow the video, and this is raw footage. Except for the small pause where I had to go afk during recording. Both songs are from Mass Effect 2.
Try the video in 5-10 minutes, it's still uploading.