What options do I have to agree on a rental car at affordable prices in San Francisco. Rent a Wreck?

I think a pass me around the city of San Francisco, no rental car needed. But the journey on the north coast, or perhaps the Wine Country, Redwoods or Should I rent a car? Is there car Replacement copmpanies? What is the green turtle? Do they do day trip somewhere? HELP and thank you for suggestions.

Rent a Wreck is OK. I watch me City Rent a Car, I found it a reasonable price.

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