Hi,
@wez,
Welcome to the forum! It’s so great to see an uptick (at least I think I see one) in new members planning their first camino. You are so lucky to have the privilege of walking your FIRST camino!
I usually try to answer the question asked and not give unsolicited advice, but here I will break that rule to say — leave it open with no decision yet. Over the years, I’ve seen many forum members who had planned rest days only to find that they couldn’t bring themselves to stop walking, or who didn’t want to leave their “camino family,” or who decided to spend a morning in a place and then walk on in the afternoon. Of course there are lots of forum members who plan and take and love their rest days. But at this point you just have no way of knowing which category you will fall into.
But assuming you do take a rest day, the place you stop will depend on what you want the rest day for. Do you want it to be able to experience a special place you would otherwise just walk through? If so, Astorga (though only two days out of León), Ponferrda, and Villafranca del Bierzo jump out at me. Or do you want it because you think you are actually going to rest? If so, placing it somewhere in the middle makes a lot of sense. That would mean Triacastela, maybe Samos, maybe O Cebreiro or places in between.
Long way of saying that, as a planner myself, I love to think about all of these options. I like to have them on my radar screen, but then when I’m walking I adapt my actual plan to fit the way I’m feeling. And you just won’t know that till you get on the Camino. Enjoy every step, buen camino, Laurie