Hi Natalie,

I love the idea of creating a community space to educate people about renewable and sustainable energy! We definitely need more collaborative spaces like this to educate people on sustainable living.
I can see this model working in closed housing communities/community centres across the world.

Just a thought - What if you have interactive games/installations that reinforce ideas and behaviour around using and creating renewable energy by creating collaborative 'Play spaces' in your eco-park... Its a great way for families and communities to adopt positive behaviour towards sustainable living.
eg:
1. you could have a floor game with piezoelectric generators installed and a sound/light feedback to show how much energy is created.
Alternatively - (like your see-saw powered fountain) the energy generated could power lights/sound that feed back into the game making it self sustainable.
http://www.playgroundmarkingsdirect.co.uk/playground-markings/games/
http://www.sustainabledanceclub.com/products/sustainable_dance_floor/
2. You could have a segregated paper toss bin game where the amount of trash thrown in the bin gives you a quantitative feedback - like 5 kilos of newspaper = 25 trees (random numbers not based on research, using it as an example)
I don't really know how financially sustainable it is, but just an idea :)
Would be happy to talk further and bounce around ideas if you're interested...

Good luck on your project! Very excited :D

Cheers,
Kavya