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...
If I can't rewire animals brains to stop suffering, screw it. Pave over every forest and jungle and other natural habitat on the Earth. Drive every animal species extinct but us (save pets people want to keep). Find a plant species that can generate oxygen and food without being pollinated by insects. (algae, maybe?) Also, save dolphins and great apes, who I would probably count as people, rather than "pseudo-people," like other animals, construct luxurious habitats for them. Find some way to limit their population besides Malthusian scarcity (sterilization of most adults, probably).
Get rid of religions, try and make everyone as wealthy as possible, try and invent drugs that don't screw up your brain that much but still feel awesome, make sure they are (obviously legal) and widely available. Eliminate every communicable disease, including STDs. Invent some kind of male-usable birth control. Eliminate nudity and sex taboos, and hold enormous public orgies every day, convince Eliezer Yudkowsky that the singularity is not gonna happen and he should spend all day writing HPMOR.
...why?
...why?