Of the 12 al 17 from December, for 3 days or more, Dto. of a 10%.
Take a walk along the Rio Dulce Canyon. Climb to the peak of the Head walking, too easy. You can also spend the day walking and visiting museums in Siguenza and, why not, giving a feast of torreznos, taking reeds, or crumbs, or roast lamb, or roast kid … Well, there goes that good things to do in Siguenza!