I guess you cant post anything hypothetical on this forum.
You can post pretty much anything you like on this forum, as a quick survey will tell you. What you don't get (as in the real world) is the right to only get replies that you like. If people think you have asked a stupid or pointless question, they will post saying so. Think about your question for a minute. Since Special Relativity , which is the best guide we have about how the universe works, says nothing can be accelerated to the speed of light (let alone faster), then your hypothetical journey just couldn't take place. But since you are asking for "creativity", I'll try to go along. Since the amount of energy needed to accelerate an object nearer and nearer the speed of light increases exponentially, before you even got to light speed you would have to exhaust all the energy in the universe, so by the time (!) you got to Mars -- why is it always Mars in these damn questions? Why not Jupiter, or Fairbanks, Alaska? -- there would be no Mars to go to, and no Earth to return to, and no spaceship, and no you either. In any case as you got faster you would blue shift the microwave background radiation and increase its temperature. Eventually you'd roast the ship and all aboard. And if you got to beyond the speed of light (let's invent a sci-fi type "twist" to keep the plot intact*) you would end up arriving before you departed, and there would be a paradox, and you'd cause a Moebius twist in spacetime and become your own grandfather or something. And there'd be sexy green alien girls with pointy ears and nice boobs. Is that better?
* Like in Poul Anderson's Tau Zero.