How might a planet be made of mountains? (And ocean)

How would it be possible to have a planet with two defining surface features, ocean and mountains? Such a planet would have to be habitable for humans who arrive there, though it does not need to support humans evolving and developing over time. Everything above sea level has to be mountains, with valleys mixed in.

If it helps, think of the book series Riverworld. Except I'm not really getting into any rivers or anything, and I'm allowing oceans.

Oceans can have underwater plains, but I don't want the oceans taking up more than 80% of all surface area. I also don't want a planet covered by clouds of volcanic ash. This planet's geography must also be natural, with no terraforming.

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How might a planet be made of mountains? (And ocean)

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