Terminal velocities[1] for a horizontal human at the surface of some round rocks:

  Earth 120mph
  Venus 15mph
  Mars  928mph
  Titan 21mph

Presumably you could do a little better spread-eagled with baggy clothes.

Titan has the advantage that humans and pigs could fly without motorized assistance. It's like paradise.

But I suspect cats and squirrels (and dandelions?) are gonna have some hard falls on Mars.

1 Terminal velocities from https://www.reddit.com/r/askscience/comments/4wkd99/what_is_...