I love it when someone asks the community for creative ideas. They're always interesting.
Without the possibility of technologic advancement, I don't really feel that utopia is a worthwhile goal. Every version just feels like stagnation, which bothers me. I don't see much point in life if everything's all planned out.
And any plan we could propose would eventually fall out of fashion unless measures were taken to prevent societal change. Some configurations are more preferable than others, sure, but in the end the deal is radical, unprecedented change, cyclical rise and fall of civilizations, or stasis. The last is boring, the middle is boring but commonly accepted, and the last is scary. Take out the scary and you have boring and more boring.
If we're going for stasis, I vote for some kind of enforced anarchy or nuking the world. Those are at least somewhat interesting.
He didn't specify stasis.
Assume for the time being that it will forever remain beyond the scope of science to change Human Nature. AGI is also impossible, as is Nanotech, BioImmortality, and those things.
Douglas Adams mice finished their human experiment, giving to you, personally, the job of redesigning earth, and specially human society, according to your wildest utopian dreams, but you can't change the unchangeables above.
You can play with architecture, engineering, gender ratio, clothing, money, science grants, governments, feeding rituals, family constitution, the constitution itself, education, etc... Just don't forget if you slide something too far away from what our evolved brains were designed to accept, things may slide back, or instability and catastrophe may ensue.
Finally, if you are not the kind of utilitarian that assigns exactly the same amount of importance to your desires, and to that of others, I want you to create this Utopia for yourself, and your values, not everyone.
The point of this exercise is: The vast majority of folk not related to this community that I know, when asked about an ideal world, will not change human nature, or animal suffering, or things like that, they'll think about changing whatever the newspaper editors have been writing about last few weeks. I am wondering if there is symmetry here, and folks from this community here do not spend that much time thinking about those kinds of change which don't rely on transformative technologies. It is just an intuition pump, a gedankenexperiment if you will. Force your brain to face this counterfactual reality, and make the best world you can given those constraints. Maybe, if sufficiently many post here, the results might clarify something about CEV, or the sociology of LessWrongers...