More people walk the last 100km of the Camino Frances than any other part of any Camino. If you only have a short period of time or you just want to experience a bit of the Camino this is a very common route. The actual distance is approximately 115km.
Day 1 Sarria to Portomarín (22km)
Day 2 Portomarín to Palas de Rei (25km)
Day 3 Palas de Rei to Aruza (29km)
Day 4 Aruza to Rua-O Pino (18km)
Day 5 Rua-O Pino to Santiago de Compostela (20km)
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.