As none of you are familiar with the local countryside, Sophone gives you a few instructions as to how to get there, after which she launches into a bit of local history.
"Castle Mistamere," she tells you, "was once the home of an eccentric Chelaxian enchanter named Gygar. He set himself up here three hundred years ago and pretty much ruled over everything for a short while. Guess he wanted to be left alone, as there weren't a whole lot of folk to rule over back in those days. After he died nobody claimed the place, and so it fell into ruin. It's enough out of the way that people don't bother with it. It's had a bad reputation my whole life, so I've stayed away from it. It's also close to a bad part of the Fenwall mountains known as the Shales. I've heard talk of flocks of wyvern and worse nesting there. You won't find this slip of a halfling lass anywhere near there, no sir. They say I am crazy, but I'm not suicidal."
With that she finishes the last of her cider and hops off the chair. "Good luck," she smiles and grabs her cloak to head back into the night.
By this time the rain has begun to let up a bit and you can even see the moon poking through the clouds from time to time. If you want to head out now you might get lost in the dark (OOC: at least three DC 18 Survival checks), otherwise you could wait until the morning and should have no trouble finding Mistamere (OOC: one DC 15 Survival check).