I too have post polio syndrome. Stairs and slopes of any kind are a big problem. In the past I have relied on my DH to give me support in walking and we could do a lot. We have cruised all over to many countries. Now, however, my DH has ALS (Lou Gehrigs disease) and he is the one who needs help getting around. He will be using a wheelchair when we go on our transatlantic cruise at the end of October. At least I'll have something to hold on to as I push him! Go early to the muster if you can stand for a time otherwise go later and use the elevator.