cool idea. I think we have one here in San Francisco. I just wonder about rain/snow (for some areas) and then naps..where do they take them? But in general I think the kids (and adults) need more outdoor time
As far as naps - our kiddo doesn't take a nap anymore, so it isn't an issue. Younger classes typically get out earlier, so you could do a nap then. I'm not sure there are any all day outdoor preschools....