When you board you will enter a building(terminal) and walk along long, wide hallways. As you go up the hallway is enclosed with glass. I don't like heights and never felt too high or unsafe in any way. You may not even notice when you board the ship, it is a very smooth transition. If I'm not mistaken you board on deck 11, where you can go out to the solarium pool area and then to the Windjammer for lunch. The ship is absolutely gorgeous! Have fun.