I would send them on farming expeditions to the Atacama Desert for six months, make them work in space suits and see how they do before we go forth with any further planning. I’ve got just the first two choices, that nut job who drove all the way from Houston to Florida, in diapers without stopping, to get her man back.
Antartica could be closer in temperature, but still not cold enough.
Why not the moon after that? I am sure there are good reasons nonetheless the moon seems more feasible