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Monica, you need not fear being alone. I walked the Fisterra route last year (June 29-July 6) and by my rough estimate there were about 50 people at each stage. Sure its not as populated as the Frances, but you'll still see plenty of people, and it is well marked going towards Fisterra/Muxia...
When you arrive in Fisterra and Muxia you get a... certificate, if you want to call it that, that you completed the trek there (though I don't recall if they require proof that you walked it). Upon returning to Santiago you can probably get a Compostela there.
As for the 'daily cost' walking...
The albergue in Negreira has a credential specifically for the Fisterra route.
I walked the Santiago-Fisterra-Muxia-Santiago circuit last year and may have some advice for you.
Very few people go to Muxia, and even less walk back to Santiago. That being said, the route (as of June 2012) is...
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