My hubby and I were on the Mariner last Sept and are due to go again this Aug. I believe it was all glass on the rail wall, however I could be wrong. We did not use our balcony much so we decided to try an inside cabin this time. we will be in room 6523. You will love the ship, we live in the south and are within driving distance of the ship so we have decided to make the Mariner an anual event.