The more research we did on Porto and the Douro Valley, the more we realized we need some 'on the ground' support. We were provided the following map which has proven to be helpful in planning visit to quintas of interest:
A Port Map of the Douro
We have also located an extremely helpful guide to shepherd us through the Douro, since many of the quintas are remote from Luxury, Boutique Hotel, Douro, Golf, Oporto, Portugal - Casa da Calçada and driving may be best left to someone with more experience.
It will be grape harvest ('vindimas') time during our visit and we have been invited to take off our shoes, put on a pair of shorts and join in the traditional 'stomping' of the grapes...should make for some interesting photos.

