Then do it !
I used to volunteer for Mass Audubon and the home-schooled kids came in one day a week for all their lessons on nature,animals,rocks,vernal pools etc. It was very hand-on and very nice to see.They spent a lot of time outside on the beautiful property being educated.
There were about 10 kids,of various ages,and they taught them according to their age. It was very nice to see.
A friend of mine volunteers at the Nature Center in one of the local parks. They do projects for home schoolers all the time. Some of them sound a lot neater than any I ever got in school. They're currently hatching butterflies and mapping the migration paths of Monarch butterflies.
There are a lot of resources for home schoolers now.