Ask HN: Retreats in the Bay Area?

I'm in need of a good retreat, anyone have any recommendations for a digital detox style retreat, perhaps 3 or 4 days long?

Any suggestions are welcome, even places that don't restrict internet. I'm interested in any suggestions across the broad, from no restriction, to total restriction. Just somewhere relaxing.

I'd preferably still want to still be able to access email once a day just to make sure the world hasn't ended.

What would be fantastic, is a place that also provides healthy meals etc.