You already passed Pamplona, a fine rest day spot, albeit rather early on in the
Camino Frances. S0, considering where you are, heading west, consider a rest day at Logrono, Santo Domingo de la Calzadas, or Burgos. At each place, you can find interesting things to do and places to visit during the layover.
Farther down the road, you could well plan a extra day at Leon, Astorga, or Sarria. I regularly stay an extra day at Leon, as it is the regional capital, has a magnificent cathedral, and every conceivable thing you could need. Astorga has interesting architecture, history, and is the center of Spain's chocolate industry. Sarria is 111 Km from the Plaza Obradoiro in Santiago, in front of the Cathedral. The center of this square contains the "official" distance marker. Sarria also has everything a pilgrim could need, readily to hand.
As regards Sarria and the now opening, annual "peak season," I advise planning you earlier Camino stages to arrive at Sarria
not on a Friday, Saturday or Sunday. As many pilgrims start their Camino from Sarria, obtaining lodging CAN at times be difficult, especially during the summer season. However, if you arrive Monday through Thursday evening, lodging should not be a problem. But there are other considerations. Please read on...
Personally, I try to arrange my pace earlier on to arrive at Sarria from Tuesday through Thursday afternoon, as that avoids
both the starting surge and resultant demand for bed space for people starting our, as well as the follow-on "wave" of pilgrims leaving Sarria each Saturday, Sunday or even Monday morning on their way to Santiago. This factors in the surge or "pig in a python" effect of a large number of pilgrims all leaving on what is routinely a five-day walk to Santiago. If you leave when everyone else does, then bed space will be comparatively more difficult to secure for the same five-days on your way to Santiago.
The equation is this; assuming you want to arrive at Santiago (also not on Friday or Saturday afternoon to avoid the surge at each night's stop), and working backwards from that, backing up five-days, the optimum window to arrive at Sarria, stay one-night and continue on to Santiago would be arriving at Sarria on Tuesday, Wednesday or Thursday. These are
relatively easy days to obtain lodging at Sarria, and you also avoid getting swamped at Santiago on the back end. If you arrive at Sarria on these three days, and leave the following day for your five-day walk to Santiago, you would normally arrive at Santiago on Sunday, Monday, or Tuesday.
After Sarria, it is a surge or push to get to Santiago. It seems to affect people like a magnet. You will not want to stop the farther along you get. however, if you have medical issues, DO take your time. St. James is not going anywhere anytime soon...He will still be there when you arrive.
I hope this helps.