Cathy tries scuba diving in an effort to maximize the fun on her Puerto Rico vacation; Paul, reeling from the news about Joy, tries to keep it together during a speaking engagement. Later, Sean decides to take a respite from dating after undergoing yet another breakup.

Cathy finds herself spending time with a stranger; Paul is flattered by the attentions of an American tourist; Sean is guilt-ridden when his sister doesn't return to the dive boat.