Dude Ranch Pack Idea

I think your ideas are great! I don't know that fairies would work well with the version of a dude ranch that I'm thinking. I'm thinking more of an old west mountain yellowstone vibe. Plus I think this would work best as a game pack and not an expansion.
I don't typically play with occults in the sims so for me the selling factor of a fairy pack would be the world. I think Scotland or Ireland or even Iceland would be great for fairies.
As for the dude ranch suggestion I think it would be a great opportunity for vacation style play, it would be a fantastic was to introduce horses. I would still like an opportunity to live on/work at/run a ranch but I would likely use it for my sim families to go on vacation.