Yes, I know, a civilization able to send a colony space ship on distance of many light years wouldn't probably be very sensitive to a harsh climate... Assumptions: - well within habitable zone; - there is some local life that was able to generate atmospheric oxygen; - you can pick a whichever place good place on its surface; - no cheating, no GMO humans; ;) - if any lucky but possible additional natural processes were needed please assume them but list them. With ex. 8 earth masses it should roughly (ignoring matters of density) it should have roughly twice earth gravity. Crushing, but not directly lethal for unprotected human. Do it have to be a water world? Would it have to have ultra dense atmosphere? (Could some lucky strike of a planet size object strip it of its volatiles, thus preventing appearance of water world with ultra dense atmosphere) How would look its plate tectonic? Would it be relatively flat because of gravity, or with such mass it would be so geologically active that mountainous landscape would anyway appear?