Did I like this movie. No.
Why. It's corny. Acting is not the best, but one can blame the script.
Why again? I am biased in that I did the Camino 2-years back & thoroughly enjoyed it. Was buggered each day, slept well. And started another new day. Met the most wonderful people doing exactly as i was.
Any regrets? Most enjoyable age (IMO) would be before 50. I was 75, but fit.
Get a good idea of the Camino? Go to YouTube. There are countless short films of people's real experiences, real dramas, etc. Best preparation about what to pack, what to wear, and everything you need to know.
Do you need to know Spanish? Not really. Your company is the many others walking, and they're from all over the world. English is the prominent language, and people from all over want to practice it. Take an Iphone with 'Translate' and Google Maps just in case. Expect to get lost occasionally, which is not a bad thing.
Back to the film. How come there was nobody, or very few others, walking as well. Did they pick a slow period?
Suggestions. Do the Camino yourself. It's all worth it, whatever your reason/s. The experience is better than any movie you'll see. The scenery is fantastic. The locals are amazing. The food is unforgettable.
I apologise for not liking the movie, but is simply did not connect to the reality that I experienced. A really good movie is waiting to be done. The Martin Sheen attempt is far from perfect, but the best so far.