Contact the cruise managers and speak with the individual who can tell you if a helicopter can land safely on the ship while in motion and sea-bound. Clarify with the staff the logistics of such an endeavor, and identify any and all details about the process, from landing times, landing pads and the location of the ship for the easiest and safest landing.
Search online for a charter service that offers the ability to escort you, via helicopter, to a moving, sea-bound ship. Be clear as to the many details you gathered about the protocol of helicopter landings, and put the charter organization in contact with the individuals you spoke with from the cruise ship. Make sure these two parties communicate the details of the landing.
Make clear the date and time you plan to charter the helicopter and your desire to land on the cruise ship with the ship directors and charter organization. Once everyone is on the same page, pack your bags and enjoy a luxurious trip. Meet your charter helicopter at the chosen hanger, load your bags and gear, then sit back and enjoy.