Keeping with the spirit of walking a portion at least of a Camino I have just finished planning a week walk between Santarem and Coimbra. If inspired I may keep going to Porto.
Unlike my first Camino, I have booked rooms in advance. This portion of the Camino is not heavily traveled. There are many villages along the way but few places to sleep. This may begin to change as more people begin the walk in Lisbon.
My plan is detailed using a google map: https://drive.google.com/open?id=1FP3NqadPBA86cWun7aSiHk0aRsIvv_q_&usp=sharing