If you want to go into space. You could try Orbiter. It's a freeware space flight sim. www.orbitersim.com
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Orbitor is a great game but it is VERY hard to learn to use. I have had it for 5 months and I can just get into a stabilised orbit, let alone travel to another planet.
Yeah, Orbiter is hard, but fun... Just the awesomeness of pure, unendless space... It's available over at AVSIM too... There's a couple of files you need to download as I remember...