I challenge you to find a spot that is NOT a good spot to dig a well. Since there is water under the ground everywhere you drill in the two States that I have lived and Drilled in. Dowsing is an interesting topic and will bring up lots of controversy from both sides of the fence. But you will find that many professional Well Drillers have a very low respect for it.
I'm curious; what method do you use? This is another topic that brings up many different answers.
Don't get me wrong on this, but even though I don't believe in Dowsing, I do use the coat hangers to find buried pipes. This is not a trick or a hoax, it is simply magnetism and it works well.