Win RT Flights for 2 to Brisbane, 14nt Cruise to New Zealand, $500 on Board Credit from Webjet

So you need to enter the draw which takes 2 seconds and then "your friend" also needs to complete the draw from your referral link.

You can continue the chain of invites per the T&Cs.

5.The Initial Entrant, having received the Webjet Marketing Pty Ltd email invitation, must ensure he/she complete all mandatory fields of the entry form, and submit as instructed before the Contest Closing Date. Upon successful submission of the entry form, he/she will receive a unique link that must be sent to the friend being invited to the Team.

6.The Invited Friend, having received the invitation to the Team, must ensure he/she fully complete all mandatory fields of the entry form and submit as instructed before the Contest Closing Date. Upon successful submission of the entry form and having teamed up with the Initial Entrant, he/she will receive a unique link giving them the opportunity to become the Initial Entrant by sending a friend an invitation to join a new Team.

7.The Initial Entrant and his/her Invited Friend will only be allowed to team up once. Any attempt or suspected attempt to team up more than once with the same person by using multiple email addresses or pen names, or any use of robotic, automatic, programmed or any entry methods not authorized by these rules, shall be deemed as tampering and will void all Entries. All Entries that are incomplete, illegible, damaged, contain an erroneous phone and/or email address or do not conform to or satisfy any condition of the rules may be disqualified by the Promoter.