This was definitely filmed at the Stan Dale Conference Center at Harbin Hot Springs (before it burned in 2015), in Northern California. Indoor and pool footage is at the conference center which may not be familiar even to Harbin regulars. Some outside footage appears to be further away from the conference center - possibly even in the meadow.
Prior entry.
It appears to be a clothing-optional resort in N. California. It looks simular to Harbin Hot Springs but it does not look like that facility.
Its filmed at Esalen in big sur