Hi Suzzy,
If I could go anywhere in the solar system, I think it would be really interesting to visit some of Jupiter and Saturn's moons. Jupiter's moon Io has strange sulfur volcanoes. Jupiter's moon Europa is completely covered in ice, but some people think it may have a liquid core. Saturn's moon Titan could have lakes of liquid methane. I think these places are far more alien than Mars, but unfortunately this also makes them a lot more hostile and dangerous. It is unlikely that people will be able to travel to these places anytime soon, but we can send unmanned spacecraft or rovers there. The Cassini Huygens probe has already landed on Titan and sent back interesting images. Hopefully, we will be able to send more unmanned spacecraft to explore these moons in the future.
Kris