RCI is the agency Worldmark® is currently utilizing to offer their owners the ability to trade a week of credits for a week of vacation at any timeshare listed in the RCI Catalog. RCI also offers Worldmark timeshare owners flex-change which consists of a 59 day booking window and allows you access to any size resort in any season for just 4000 credits! Owners also enjoy using II (Interval International) and Trading Places.