Welcome to cruise-chat Kagibert! Many of the cruiselines have eliminated jet-ski options and they often even have announcements that discourage guests from renting them or scooters at the ports. The possibility of accidents, major injuries and law suits are the reason for the cautions. Most ports and beach areas will have them for rent. At many ports they run around $60. per half hour although on the private islands where there is no competition I've seen them as high as $90. per half hour.