Well, I got bored and decided to see if I could get into the back of the Dal banks where the giant piles of gold are, and it was quite easy. (I also searched and didn't see this anywhere, so if it's old, I'm sorry.)
First, this little ledge here:
We can't actually land on it, but that's what we're aiming for. All this takes is a little bit of lag, and a couple tries.
First, get to roughly this area:
Anywhere in that general area so you can fly into the bank easily.
Flying in...
When you get inside you only have a few seconds, so aim for an area right above the ledge in the first picture. You won't actually land on the ledge, but if you've landed in the right area, you should get a screen like this (note: I did not zoom in, this is what my camera does when I land here):
At this point, just walk forward. If it pushes you out to the side, just run out and fly back in, try to keep centered.
Voila! The banker back there actually works, too. To get out, just jump out between the banker booths. Nothing terribly interesting besides that, but you can hide in the corners where people are unable to see you if you want to hang out in Dal and not be bothered.