I went on a tour of the Green School today. Amazing international school K-11. It's a free tour. The school is environmentally friendly. The buildings all bamboo, they have animals, solar panels, gardens, etc. Amazing things going on there. I would say it is now one of the best touring attractions in Bali. I think the tour is offered 3 times a week. A definite must!
Careful, if you look for it on Google maps app for iphone it takes you to the wrong place about a 15 minutes drive from the actual location. So ask people location before going. It's just a short drive outside Ubud.