The surface of Jupiter is a sea of yellowish cloud tops that roil with winds continually circling the great planet. The gravity at Jupiter's surface is 2.5 times the gravity on earth and inside the planet there is great pressure.
1 Additional Answer
Jupiter is made up of gases like the Sun, so there really isn't any land and no volcanoes. Jupiter may have some craters, but it seems as though those are just dips in the gases on the planet. You can find more information here: http://library.thinkquest.org/TQ0312488/Jupiter.htm