Congrats. A better choice than the Crows Nest property by the looks of your photos and a view of some Google pics certainly reveals a charming corner of the world. Plenty of interesting terrain for nature lovers. If you are considering growing coffee, would it be prone to frosts? However, you are in the granite belt so wine or grape growing might be a go. I see there is a place called Stacy's in Tregony that does accommodation. They must be hooked into the electricity grid. Is your property too far from it to do the same?
If there's a creek surely there's chalcedony.
I'm no lapidarist but looking at that boulder in the second of D's photos, I'd say there is a better than average chance.