Take nothing with you that would greatly upset you if stolen or lost. My practice is to leave all my gold at home and wear either sterling silver or stainless steel replacements - in the case of religious medals. I also leave my gold wedding ring and expensive watch at home at take a solid sports watch.
The same goes for items you always carry in your wallet. Before I depart on a foreign trip anywhere, I always STRIP my wallet. I remove any cards, photos, spare keys or other items I know I will not need on Camino, and which would prove a headache if lost or stolen.
In addition to my national passport and pilgrim credentials, I only bring: one major credit card, one debit card, my driver's license, my health insurance ID card (I have a Blue Cross / Blue Shield plan that works overseas), a card attesting to a special medical condition, and a US Passport Card.
This last item can be obtained when you renew a US passport. It is a standard-sized card good for crossing the US land borders, or traveling to nearby foreign areas by auto or ship (Caribbean, Canada, Mexico, etc.). It is not valid for flying anywhere. I bring it in case the passport gets stolen, it will at least get me into a US Embassy to obtain a replacement. I also use it in shops to prove US citizenship so I do not have to retrieve my passport so often. Most folks just make a copy of the passport bio page. But my card is waterproof and fits in the über thin "Butterfly Wallet" I use on Camino.
I hope this helps.