I’m very much a novice, having only completed half of the
Camino Frances in three instalments so far since June 2019.
However, saying ‘Buen Camino’ is definitely a good tradition, as is leaving something at Cruz de Ferro.
Collecting stamps is definitely a worthwhile tradition, but not sure about this running into Santiago thing (I completed the last 100 km first, so I’ve already done that bit, though I will repeat when I complete the rest of my Camino).
I think everyone has small personal ‘traditions’ some of mine include always rewarding myself with a big bottle of water and a packet of biscuits (usually Filipinos) at the end of my day’s walking, and (if I’m alone) starting out each day’s walk by listening to Ventura by Tyler Bates (theme from the film The Way). I know it’s corny, but it gets me in the mood for the next five, six or seven hours!