Polecanthus
This unusual dinosaur is one of my personal favorites. It had a double row of huge spikes on the back, a double row of plates on the tail, and a boney plate over the hip. At 12 feet long it looks like it would be perfect to ride if you sat on the boney plate (and the polecanthus didn't mind). You could even shoot water balloons from from those big spikes on the shoulders.
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