What final guidance or advice in response to this question to give Marge and Helen before they leave for their cruise?

Scenario:Marge and Helen have learned so many new and informative aspects of intercultural communication and culture. They have also learned how to engage with people different from themselves and broaden their perception of other people and other cultures. Marge and Helen now ask, "How much of their own culture and cultural beliefs must be set aside so that they can fit in?"