<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Sweet Willie:
That puzzles me as I believe both are US territories. PR does not require customs so I made the assumption the STT would not either.
Wonder why this is??</font>
The US Virgin Islands are considered a duty-free port and while you can bring back much more than from foreign countries, there are still limits ($1200 worth of goods I think).
Puerto Rico is within the US Customs zone and there are no customs formalities when leaving, there is an agriculture inspection though.