I've talked about this before, but the Dinotopia series features a fantastic world where sentient dinosaurs work side by side with humans in a utopian society (Dinosaur Utopia- get it?). Helping this fantasy is of course the beautiful scenes painted in the children's books of massive ancient cities and people just having fun side by side with dinosaurs.
8. Harry Potter Universe
Yes, again, there's evil here. But overall, it's kept in check by a massive community of witches and wizards. Reading the Harry Potter books made thousands of kids want to go to Hogwarts, even if they were far over the age of ten. Fun fact: The reason most of us didn't get our Hogwarts letters was because Voldemort wiped out all the Ministry's records of Muggle-Born wizards and witches born from 1985-1998.
7. Pokemon World
It doesn't really matter what age you are, who wouldn't want a team of cute animals as your friends and weapons of destruction? The Pokemon world, when not threatened by global disasters thanks to idiots in matching berets, is a place where you get to own and train Pokemon. I won't lie, if I had the chance I'd be a Pokemon trainer in a second.
6. Animal Crossing World
5. Star Trek
Yes there's wars, but for the most part the United Federation of Planets is a Utopian society where anyone can literally be anything. Artistic and scientific pursuits are seen as equal, especially since money has become a thing of the past. Travel to the most distant stars or settle down at your personal vineyard, your future is yours.
4. Firefly Universe
3. Avatar Universe
2. Every Studio Ghibli World (Except Mononoke)
1. Looney Tunes Universe
From its conception, the Looney Tunes world has been one I've always wanted to live in. Nobody dies, even from a direct gunshot to the face. You just turn your bill back to the front of your face and you're good to go. Play with the characters that brightened up your childhood? Yeah, I'm in.