Do stop at several of the spots on the beach. Each one has a separate vibe and everyone will find their favorite.
Do teach them that its ok to just no mon when it comes the vendors and store owners.
Do take them into town and show them things like the Chinymon Store and the HiLo. Its an experience to see what Jamaicans have available to them.
Do make sure you get a chance to see some live music. There's nothing like it.