Hi Thebes, although many women crochet (hacer ganchillo), not so many knit (tejer). The quality of the yarns I found was not so good in the Pto Pta area, although there is a shop on JFK (in Pto Pta) called Mi Regalo that has some OK stuff.
Actually, I bought some twiney-like ribbon there used to wrap presents and I knit 2 halter tops with it - one was gold and was fuschia. They were so beautiful, but it turned out to be really expensive, as I bought it by the yard instead of by the ball....no al por mayor price given...
When I found out I was pregnant, however, I had to start buying yarn off Ebay....because Caribbean baby or no - booties and bonnets are a must! Yeah, I'm old-fashioned that way.