The alien city under the Mojave. I would be able to live forever, since that city seems like it would be made by the same aliens who made the Cabot helmet thing. I already said where I would live, in a similar thread to this one a while ago. I would find a vault that I could restore to functionality. I would scavenge and repair robots to help me and I would trade and repair junk to anyone who would pay me to. I would also disable the vault terminal outside of it, so no one could hack or use it to open the door and come in. I would use the robots to trade and get supplies for me if needed. I would spend my time messing around with tech stuff, using the recreation room in the vault, read books I would try to get my hands on, etc. Let the wasteland be the wasteland, I would have a vault just for me .