@Bernie Brunino, If you like the sea, the
coastal route is for you! There are lovely towns, lots of coastal paths right along the seaside, lots of forgiving boardwalk to walk upon and very few hills. We did it in the spring and loved every minute of it. We walked parts on the Senda Litoral (the path that hugs the coastline) and parts on the Coastal, when it was impractical to hug the shoreline. If you do the coastal, I highly recommend walking from the cathedral in Porto, down to the waterfront of the Douro River, and take the riverwalk all the way to the sea, and then northward to Matosinhos. So many folks take the metro to Matosinhos, and I feel they missed out on a most serene walk! If you wish to see my walk, you can
click here for my Day Fifteen to start from Porto along this riverwalk.
I have done both walks, the Coastal and the Central so you can even compare the two on my website and make your decision! There are lots of discussions about the central route vs the coastal, but for me, they both offer unique and interesting features!
Buen Camino and happy planning!