The walk from Valencia do Minho to Santiago de Compostela is a beautiful and leisurely one. You could walk from Tui which is just across the bridge in Spain, but since you are walking the last 100km of the Portuguese route it only seems right that we start in Portugal. Valencia do Minho and Tui are separated by a bridge over the river Minho.
Day 1 Valencia do Minho to O Porriño (18km)
Day 2 O Porriño to Redondela (16km)
Day 3 Redondela to Pontevedra (19km)
Day 4 Pontevedra to Caldas de Reis (19km)
Day 5 Caldas de Reis to Padrón (17km)
Day 6 Padrón to Santiago de Compostela (22km)
The above is only an example of what you can choose to do. There are many ways to walk the Camino. If you would like there are transport services that will carry your backpack or luggage from place to place so that you only need carry a day pack.
There is a pilgrim’s Mass every day in the Cathedral of Santiago de Compostela. It begins at noon. You are not allowed to bring your backpack into the Cathedral so you will need to check into your lodging or store your pack prior to entering. The pilgrims Mass is very moving experience whether you are Catholic or not it does not matter.
It is best to make reservations for your stay in Santiago de Compostela as it can be very crowded depending on the time of the year that you arrive. Booking.com is an excellent resource for making reservations.