I'm an experienced surfer from Portugal. I would recommend Ericeira, Peniche or the "Costa Vicentina"/SW Coast for your trip. We get plenty of swell in November/December and you have a whole variety of surf spots. SW Coast is the least crowded during that time, but it doesn't have the flawless conditions as Supertubos (Peniche) or Coxos (Ericeira), for example. I work in a surf travel agency so let me know if you need any further information.