Any of the Voyager Class ships (Voyager, Explorer, Adventure, Navigator and the Mariner of the Seas) They're all based on the exact same shell with suttle differences between them.
Sidenote: Technically the Navigator and Mariner are slightly larger, due to the larger enclosed teen areas (replacing the kids pool on the three earlier ships) and the balcony's that are built outside of the ship instead large holes cut-out of the hull.
HAL - Oosterdam - May 05
RCI - Mariner of the Seas - August 04
HAL - Volendam - July 03