Well, I don't know if the following count as "ships": whitewater canoe, bass-fishing boat, water-ski boat, log flume & thunder-river pontoon at various amusement parks
(maybe fifty times for all the above). I guess the largest boat I've been on was a pan-fishing boat (held about 20/30 people IIRC) that I went on with my brothers, nephew & niece once in Long Island when I went on vacation as a kid. I've never been on a "real big boat," yacht, or sailboat yet
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How many times have you been up in a building over thirty stories high?