People only have to work once a month and their work is to cook for eighty people. On Krakatoa, they have unimaginable wealth and lots of diamonds. They can also relax all the time on the island.
The ways Krakatoa fails as Utopia is that it is very dangerous. There is a very active and dangerous volcano in the middle of Krakatoa. The volcano can blow up anytime and kill the people living on the island. It is no good being dead with a bunch of diamonds and money.
My idea of Utopia is mostly similar to Krakatoa, but there is no volcano. It should be a safe area, but fun still. The safeness shouldn't be overdone or else it would be boring. It should have entertainments and amusement parks. Part of the entertainments should be theaters, parks, amusement parks, internet cafes, internet connection, cable TV, and computers.