So I tried chumpy''s guide on making gold with fishing and it worked great... until one guy reported me. It seemed like that underwater location wasn't too great for me, as I am on a very populated server (Stormscale).
Fishing in the bushes! This is the spot I found and it works great. There are no resource nodes nearby. As you can see in the images below, this spot offers almost 100% invisibility, the only things visible are the bobber and the thread.
Location: 61.32 70.43
Check this out, I hope you'll like it!
Edit: Oh, I forgot, you have to be naked