Pokemon.
Monsters of incredible supernatural powers roam free, and several criminal organizations run afoot trying to control them.
And yet it's so peaceful, so calm, so serene. The worst criminals are defeated by ten year old children. There is no mention of war, and with no human hospitals around, not much disease either. And even the most toxic of poisons and most gruesome of injuries are fixable within seconds.
Children are free to explore, to find their own place in the world with the help of superpowered animal companions even at the age of 10. Free to take part in probably the most awesome sport in the world.
Sounds like paradise to me.