Matthew,
I wouldn't recommend Finca Cortesin. Although the maintenance is fantastic, the course is on a very hilly site and is certainly not up to the standard of the best courses in the area in terms of design (although its pretty good taking into account where it lies!!!).
If you do have the chance to play another round, I would try Sotogrande Old, although it might be quite crowded at this time of the season. The other courses in the Sotogrande area are fine, but at a completely different level. My favorite among the rest is probably San Roque or La Reserva.
Another alternative, which won't get you better golf than in Sotogrande, is going all the way to Marbella (30min drive) and playing there (Las Brisas, Guadalmina, Rio Real, Aloha).
Regards,
Alfonso