A vast ghost house with attractions made to make the kids
sweat (ball pools, falling ladders, you name it). All the
"games"
are designed with electromagnetic systems made to suck a
little bit of the energy displayed by the frantic kids. May
seem
like another exploitation idea, but think about
it this way:
_ Kids get a safe place where they can use their whole
energy, which gets rarer and rarer in big cities (look at the
kids in tokyo).
_ The park is free, as the energy sold pays tha maintenance
and employees.
_ Parents can tolerate to be in the vicinity of kids (as the
latter are no more hyper, they may even be able to socially
beahave, let's dream), even when
they are tired by a hard day's work, stressed about life, and
depressed about the general mediocrity of their
surroundings.
_ Kids get regular exercise, increasing the quantity of
O2/mm3
of blood, therefore making them smarter.
_ Finally, with an average of 20% of the population producing
only 10 watt 1 hour a day, you get the equivalent of 10
nuclear plants in the USA.
_ Eventually, to make it even funnier for the kids, there
could
be "restricted" areas you could access only after producing
a
certain production average in other areas, in a
pokemon/yu-gi-oh style.
_ Of course, the adult versions coulds follow, in many forms,
such as ecologic gym clubs, etc.....