Why I want to go to Mars to be part of a colony?

Several reasons and I'll try to make a shortlist here to avoid a chaotic post :).

* next frontier for mankind, first step for mankind to scatter through the Universe
* exploring a new world
* check if life is possible on a planet with conditions completely different than ours
* first chance to develop and test technologies that give humans the possibility to live on other planets
* might be an excellent candidate to make an outpost for spaceships for later generations
* an opportunity to let mankind see that we are all one, make people understand we are tiny compared to the Universe and that it would be better to get along
* an opportunity to show and try to be completely dependend on ecofriendly energy, show the world you can almost recycle everything
* it will test the knowledge, resourcefulness, limit of our humanbeing in every way, we would learn more about who we are, what we are capable of, how adaptable we are as a species
* it's a one time oppurtunity in our time, and I wish to try to be part of the beginning of us humans crossing a new boundary in our existence.
* awaken mankind to show we can do more than ending up as lazy creatures in our lazy sofas, getting unhealthy, shorten our lifespan by becoming numb and stop exploring more and learning more
* having the chance of a lifetime of learning and researching different subjects in science, technology, psychology, sociology and so on, to be able to do it on the spot and not as some distance watcher on Earth
* to be one of the humans that will have lived on Earth and Mars. It would be interesting to see how Mars effects us and how we grow old there
* write our own history, following a dream that has pondered in the minds of humans for ages, since the beginning of humans we've always had a fascination for what's between the stars and later on how it would be to go there
* to be one of the first to set foot on Mars, touch the rocks, see an alien sunset, explore caves, maybe  find proof there was once life on Mars in some form
* it might also give a bigger view on the reasons of our existence, how special are we really?
* ...

Why not send only robots to do the job for us? Because robots have a lack of emotions and expressing itself, different way of viewing things, researching things. A human might use a robot as a tool but a robot can never replace a human and is limited in its tasks.