Hey, Mike! Last year we motorsailed up the Napa this time of year, and yes, it was lovely. The spinnaker run back down the next day was mo betta than motorsailing. November 7 of this year would again be a motorsail up and potential spinnaker run back down, so it is definitely a possibility. Problem is that the Napa Valley YC charges those big stink pots $45/night and it has been suggested that they might want to charge us the same amount, despite our sailors' memberships in yacht clubs (reciprocity and all that).
I am waiting to hear back. I think the assumption is that stink potters come in clumps of people per boat, they all uber into town and drink wine and then use lots of toilet paper upon their return. I have assured the port captain that we don't even bathe, and that we would certainly buy dinner if they are accommodating. I also assured him that we are not a rowdy bunch, so I'm afraid you will have to behave yourself.
I agree that the Napa River has much to recommend: https://vimeo.com/369657131