[X] Go for one of the bunkers. They're literally built to be secure, so you should be as safe as it'd be possible to get once you're settled in.
-[X] Hostile take-over
[X] Go for a native tribe. They've been living here long enough that they obviously know what they're doing, so they could really help out.
-[X] Peaceful approach
[X] Go for the hydro gardens. It might not be as defensible as a literal bunker, but food is also very important to that whole not dying thing.
-[X] Peaceful approach