Buses between Padron and Caldas de Reis

In a couple of weeks, we hope to spend a few days in Santiago, on holiday. On one of those days, my husband would like to walk to Padron, have a meal there and then catch a bus/train back. Reading around the subject, it sounds as though walking backwards from Santiago is not such a good idea, because (a) it's not easy and (b) the route sounds dull.

Caldas de Reis to Padron sounds a better day's walking, but how would we get to Caldas? It looks as though there is a bus from Padron at the weekends, but no other days. I can't get the monbus.es website to load, and can't find anything else. So, any idea if it is even possible?

Thanks in advance for any expert invaluable local advice!

Thanks for that, Johnie.
Hubby was thinking about walking backwards, from Santiago to Padron. According to a recent thread, that is not easy. You're walking forwards on your day walk, which is definitely going to be easier! He wants to have a meal in Padron, hence why I wondered if walking from Caldas to Padron would be more straight forward.