There are lots of unique things about Mars . One unique characteristic is that Mars has the largest volcano in the solar system, Olympus Mons . Mars is also the only planet with two moons , Phobos and Deimos. If you were on the Red Planet, you would see pretty much the same thing we see from Earth. This page should give you a good idea of the weathering on Mars.
Seasons occur because of the tilt of a planet while it revolves around the Sun.
A compass will work on any planet that has a magnetic field . Since Mars has a magnetic field, you could use a compass on your next visit. But if you plan to take a vacation to Venus any time soon, you better have a really good map. The soil of Mars has a lot of rust, or iron oxide, in it. If you don't know what rust looks like, look at the metal around your house.