I shall not be doing this, as it's a long way from California, but I wanted to say that Snowdon is a beautiful mountain. I did the hike up and over it in my youth, via the Crib Goch ridge trail. Striking, and vertiginous, as well as a good place to look for glories and Brokken Spectres, if weather conditions are right.
The old-fashioned cog railway is something every steampunk should see, too, assuming that they are still running the old version. It looked like public transport for Gormenghast.