The Camino Primitivo is also called the Original way by some. It was the route first used by King Alfonso II the Chaste in the 9th century to travel from Oviedo in Northern Spain to Santiago de Compostela. At the time this trail was created Spain was mostly under Moorish control. The last 100km of this Camino is 2 stages on the Camino Primitivo and 3 stages on the Camino Frances.
Day 1 Lugo to San Romao (19.6km)
Day 2 San Romao to Melide (28.3km)
Day 3 Melide to Aruzúa (14km)
Day 4 Aruzúa to Pedrouzo (19.3km)
Day 5 Pedrouzo to Santiago de Compostela (19.4km)
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.