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I will be staying in St. Helena for a week in February 2016. While the trip will be a mix of vineyard tours, family-time, down-time, etc., I think we (2-up) can slip away for a day of motorcycle riding without being too antisocial.
Thus far, I have found only this (well-regarded) place right in St. Helena -- Welcome to Nieman's Motorcycle Rentals -- and two places down in the town of Napa proper, all of which rent Harley Davidsons. Not opposed to renting a Harley (and have had good experiences in the past) for the day but wouldn't be opposed to more options as well.
Thought I would check here whether anyone else has rented in that region and has any recommendations on places to rent, day-trip routes, etc. Would be interested to hear.
Thanks.