what rules would you have for it? I'll go first.

No kids.
Socialism.
No McDonalds, Burger Kings or KFCs. Only Little Chefs and Wimpys.
No french fries. Only nice fat chips.
No meat.
No TV, smart phones or computers, because these things cause people to become isolated and depressed. TV will be on for 3 hours a day, at cinemas only (located per every square mile) which everyone will go to regularly, and the content will therefore be of high quality. Internet cafes exist everywhere, which include private booths for porn, which is no longer a taboo and is seen as being not much different to going to the toilet. Instead of phones, everyone has some portible futuristic Skype thing.
At least one Starbucks per square mile (this one's my idea; I like Starbucks).
No adverts.
No ugly 60s architecture. All buildings are modern and made out of glass and beautiful metamorphic stone.
Clocks set so it stays bright until 10pm, even during Winter seasons. SAD is the root of a lot of problems.
Full-time 9-5 jobs 5 days a week are now 10-3 jobs 4 days a week.
Free health-care available to all.
Free high-quality therapy available to all. You shouldn't have to pay for it.
No need to register with doctors, libraries or anything, because it puts people off.
No cars. Only bikes, trams, buses and high speed trains.
Can't buy houses; must rent.
No houses. Just flats and apartments.
Marijuana is legalised.
At least one weed cafe per square mile.
Red light districts abundant.
Legal drinking age: 16
Age of consent: 21
Maximum recommended alcohol consumption: 39 units a week.
Minimum recommended alcohol consumption: 21 units a week. A happy nation is a drinking nation.
A pint is £2 everywhere.
Employment benefits available to all. Everyone is entitled to a decent standard of living and you are not in any way obliged to work. We are not a cruel nation.
No mundane jobs, that's what machines are for. In this country, jobs are more centered around creativity and fun, with amounts of fun depending on your laziness quotient.
High taxes, because we sort of need your money to keep everything nice and sparkly.
Landlocked country with no beach. Nothing's perfect.

Your turn.