Harmony is a must stop every time I pass through Cambria and San Simeon! If you are hitting the Paso Robles wine country area and are up for a pretty drive, definitely include them!
They have a beautiful location, visible as you drive under their ornate iron sign and up the hill - it's like you're invited to the party at the mansion on the hill! It's also a privilege to visit a town like Harmony - I believe on my last visit the population was listed as 17. It is an artisan town, the people who live here are all creators. And their homes aren't visible from the road at all - they are all in on some exotic secret. It's pretty amazing.