[zspade]

I love the idea colonizing our sister planet Venus. Nearly identical in size and composition to Earth - but so volatile. Mining resources would there would be practically impossible due to the pressure on the surface, never mind the cataclysmic surface turn-over events. On top of that, due to the lack of a magnetosphere, solar winds often react directly with Venus' upper atmosphere...

On Mars we might be able to build large stables domes, or close off caverns for additional radiation shielding. We could mine the planet itself for resources, and even grow crops there.