Mars has no magnetosphere which makes it a non-starter due to radiation unless you live underground or in heavily shielded dwellings.
If you have to do that you might as well start at either the Moon or my personal favourite Europa - a vast ocean of water kept warm by tidal forces underneath a thick protective crust of ice. Power would be a challenge, but there might be a way to harness either those tidal forces or the radiation from Jupiter.
If you have to do that you might as well start at either the Moon or my personal favourite Europa - a vast ocean of water kept warm by tidal forces underneath a thick protective crust of ice. Power would be a challenge, but there might be a way to harness either those tidal forces or the radiation from Jupiter.