On Earth, there is more gravity than on the moon. There is no air resistance on the moon.
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Because the gravity on the moon is only about 1/6th of that on earth. Combine that with a bulky space-suit and that's why it's harder to walk on the moon !
Earth is the only one.12 people have walked on the moon. The closest that any other planetcan ever come to the Earth is 108 times farther away than the moon is.
As gravity is related to mass, the object with more mass has more gravity. Thus as the Earth is more massive than the moon, it will have more gravity. This is why the moon orbits the Earth, and why the Earth orbits the Sun.
On the Moon, you would feel like you weighed only one-sixth as much as you would on Earth. Which is probably just as well. When you add in the space suit, oxygen tanks, thick boots and gloves, it would be very difficult to walk in Earth-normal gravity.
You can walk on any of the inner planets. The outer planets (Jupiter, Saturn, Uranus, Neptune) you cannot walk on; they are made entirely of gas. This is only a guess, but Pluto is probably solid enough to walk on.
To understand what it is difficult to walk on sand we need to know how do we walk? Walking is a process where we put pressure on earth and when one of our legs is pressing the earth hard we take our other leg in air and take a step. This process is ok with hard earth but if we are on sand, our leg started going down inside sand and that is why we feel hard to walk on sand.