How about a B&B as others have suggested, but keep it very small, renting rooms for a few weeks, focusing on folks for whom the solitude would be a plus - a retreat for artists, writers, photographers, hikers, etc. Market toward single women like yourself. And require them to show up with a few bags of foodstuffs and recipes.
Advertise in publications like Writer's Weekly, AARP. It would require minimal initial investment - not much more than if a friend or two were coming for a visit (although you might need a business license/permit of some sort and insurance).
I've visited Nova Scotia and Cape Breton and that sounds like absolute heaven to me.
Maybe, if the price is right, I'll be your first customer.
And I feel the need to add here that I'm dead serious.