[silent_jonny]

Tall, blond Jack will fit right in with all those dark-haired, short-statured Mexicanos.

In between Seasons 2 & 3, Jack infiltrated a Mexican drug cartel, no problem :)

[Ciexyz]

Actually, there are blond-haired, blue-eyed Spaniards, so Jack could pass as one of them. Or just play an American turista.