We looked into flying into PBI also because we have family there. Unfortunately, shuttles from PBI to the port for 2 adults/1 child was going to cost us $140 one way! I believe it's about an hour from the port? You maybe should check into renting a car/ van if you have a big group...probably would be worth it. Now we're flying into FLL with the same problem but not quite as expensive.
I DID EXACTLY THAT,THERE WERE FOUR OF US FLEW INTO PBI,NON STOP FROM DC,STAYED ONE NIGHT WITH REALITIVES,RENTED A LINCOLN NAVIGATOR ONE WAY DROP,NEAR THE PORT OF MIAMI,$120,FREE SHUTTLE SERVICE,HERTZ,ON THE WAY BACK,RESERVED A STRETCH LIMO,IT PICKED US UP,FOUR OF US TO PBI,$144,INCLUDED TIP AND TAXES,HE MADE IT IN AN HOUR SWEET,MIAMI WOULD HAVE COSTED US LIKE 300 ,400 MORE TOTAL.