Over 300,000 people registered pilgrims walked the Santiago de Compostela last year.
You could be involved in sharing Christ with them. Walk part of the way with them, listen to see where they are spiritually and then share with them accordingly. There will be good opportunities for intercession as well. You need to be fairly physically fit and can come for two weeks between April and October. An introduction and debrief will be given by workers on the ground.