Mars
... has about 1/3rd of earth gravity.
Which is something for which we don't know much about the long-term health effects of. It might be no better than microgravity.
They have 10km deep canyons on Mars, can you believe this? Colorado River Canyons are dwarfed against that.
It's hardly the only massive canyon in the solar system, however. The Saturnian system has some impressive ones (like Ithaca Chasma), made all the more impressive in comparison to the size of the body they're on.
You have the desert. The beautiful sunsets, the amazing sun rises.
Sounds more like Earth than Mars.
With solar panels you can harvest sun
Between the greater distance and the electrostatic dust that clings to everything, not nearly as well as on Earth. At least with most other bodies in the solar system, you don't get dust clinging to all of your sensitive electronic equipment.
you can melt ice to get water
Water becomes more abundant the further out in the solar system you go.
you can create methane and O2 to ave rocket fuel.
Not readily. CO2 is such a sparse gas on Mars, and the process to convert it to methane is not trivial. On the other hand, say, on Titan, you've got an atmosphere already full of methane. LOX can be burned like jet fuel on Titan. Most of the solid bodies from Saturn on out, and to a lesser extent in the Jovian system, are covered with tholins -- all sorts of various complex organic carbon compounds, nearly all of which could be used for hybrid rocket fuel much easier than trying to produce methane on Mars. On any body with ice, you can produce LOX and LH anyway; fuel is not really the issue. At least there's lots of LH engines to choose from; there aren't many methane engines out there.
You can fly planes or ballons.
Only with *extreme* difficulty; Mars's atmosphere is so thin it's almost negligible. It's far much easier on Titan or Venus's habitable cloud layer (there's a layer of atmosphere in Venus with a temperature similar to a hot Phoenix day at a pressure similar to that of La Paz -- and even a normal Earth atmosphere is a lifting gas on Venus, so floating colonies are not out of the question. You could even walk outside in shirtsleeves, although you'd need a mask to provide oxygen and goggles to protect your eyes from long-term exposure to the trace carbon monoxide; the small amounts of sulfur dioxide may also be an irritant).
You can make a greenhouse and plant groceries.
You can do that anywhere. But it's not nearly as simple of a process to do sustainably as you're imagining.
On Europe:
... On Enceladus ...
It's far too simplistic to declare Europa and Enceladus's surfaces as being *all* ice. And it's not like anyone would live on the *surface* of such a world when you could so readily go underground for radiation shielding. And those are but two bodies amount the vast many possibilities in the solar system. And who says that colonization needs to occur *on* a solid body anyway? It could just as well be done in space, with only mining done to solid objects (which might not even be planetoids/moons), so you don't have to have your people locked deep in a gravity well. And if you're going to choose a gravity well, why choose a deep one when it might not actually offer any health benefits?
Anyway, this is a whole red herring, because this was a discussion about exploration and the search for life. Colonization is so far off of a topic it shouldn't even warrant consideration at this point in time.
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