Tell you a a couple of mad facts.
All the planets are pretty much spherical, but Jupiter is fatter around the equator than it is if you measured it pole to pole. That's coz it spins rapid style and the centrafugal force causes it to bulge outwards. It only takes 9 hours 56 minutes.
Neptunes axis, is way different to all the others. It's tilted nealy 90 degrees, so it kind of "rolls" around the sun.