Can I invite friends onboard my cruise ship? 12 September 2019 11:25 Updated Due to the stringent security measures, only cruise passengers with a valid booking are allowed onboard the cruise ship. Related articles What currency is used onboard? Is smoking allowed on cruise ships? Can I get Internet or Wi-fi access onboard my cruise ship? Can I choose what time I dine, table size and who with? How do I make purchases on my cruise ship?