DRIVING FROM SANTANDER TO POTES (GREEN SPAIN)

HI ALL, WE ARE HOPING TO TRY SPAIN IN MAY 2013, WE ARE HOPING TO GO TO SANTANDER AND STAY AT A ACSI SITE IN POTES (PICOS MOUNTAIN AREA, HAS ANYONE STAYED THERE AND IF SO  WHAT IS THE DRIVE FROM THE PORT LIKE,THE BOOK SAYS ITS ONLY ABOUT 50 MILES BUT I AM THINKING IT MIGHT BE STEEP AND WINDEY, WE HAVE NOT GOT A 4X4 BUT HAVE A DECENT TUG, HOPE SOMEONE CAN GIVE US SOME ADVICE, MANY THANKS J@J