Anyway, more seriously, I would say that incarceration of any form ought not to be used unless absolutely necessary. That is, if someone is very violent or cannot be allowed into general society for a very specific and definite reason. At the moment, prisons can't seem to decide whether they're meant to rehabilitate, isolate, or punish people. They also seem very confused about whether they're a public necessity or a private business, unfortunately leaning heavily toward the latter. Anyway, on my Right Planet, "offenses" such as drug use or other victim-less crimes would be decriminalized and/or treated as medical / psychological issues.
I would definitely want my own little home, probably somewhere out in nature, far enough away from any population centers that I could see the stars. I would like to live with a community of some sort, but I would be much more comfortable with a "monkey-sphere" sized group of one or two hundred people, as opposed to a city of millions. In general, I think a decentralized network of small homes and communities linked by electronic communications networks would be ideal. Education would be similarly decentralized, and individualized rather than institutionalized. Oh, and all the streets would be solar roadways, which can power electric cars, and which would also house all electronic infrastructure, as well as water and sewage piping, etc.
Also, the architecture wouldn't be all boring straight lines and squares and phallic towers. Many more curves, organic shapes and materials, and more variety overall.
Oh, and there would be cats in all the walls (at least in my house).
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?The only thing I know is that I know nothing.? - Socrates
?Today you are You, that is truer than True. There is no one alive who is youer than You.? - Doctor Seuss