1. Assume the pedestrian pilgrims cannot hear you approaching. Bad hearing, conversation, self absorption, focusing on the scenery, traffic noise nearby.... there are a lot of reasons that don't include headphones and music. Given the nature of a Pilgrimage, it should be of no surprise that there is a lot of internal focus for the pedestrian pilgrim.
2. Give a loud enough warning, when you are far enough away, so as not to not startle pedestrian pilgrims. A startled pilgrim is an unpredictable pilgrim and could bolt right into the bicyclists path, causing injury to both. Additionally, it is quite unpleasant to be suddenly frightened.
3. As you approach a pedestrian pilgrim(s), slow down. This helps minimize the large difference in weight and momentum and makes everyone safer.
4. In general, except for those who somehow feel entitled differently, most rules of a shared pathway are based on what is written above and are simply normal commonsense to keep all pedestrians and bicyclists safe: Bicycles and Pedestrians yield to horses. Bicyclists yield to Pedestrians.
5. While it may seem advisable for a pedestrian walking along a pathway to be aware of bicyclists, and it is something one should try to do, pedestrian pilgrims are not responsible for your behavior on a bicycle. They cannot make a warning for the bicyclist, nor use the brakes, nor steer the wheel.
6. Pedestrian and Bicycle Pilgrims are on Camino for a shared goal. Each is there to gain some sort of fulfillment and experience the Camino spiritually or physically, or culturally, or religiously or all of the above. Loving, caring, and respecting one another requires accommodation of differences and nurturing an attitude of giving. Pedestrians can assist the bicyclist by standing aside when you know they are approaching, offering to help with mechanical breakdowns (if knowledgeable), and grabbing a piece of the bike -- with permission -- to help the bicycle peregrino make it up a steep slope or extra muddy path.
Bicycle Peregrinos can be of similar attitude by simply observing the points above.
God Bless Us All; And Let Us Love One Another.