Thank you for your replies. I've never done Western riding, so I don't know the difference (Californian and another one, is that right ?). Initially I was going to do a week in a ranch somewhere in the midwst or rockies, but it's proving too difficult to arrange and too expensive. Staying with family and friends in Connecticut, so trying to find something in New England or Maryland.
I don't necesseraly want to do western in a non-western area. And I'm just going back in the saddle after many years. I was hoping a good 1 to 3 day refresher course with a focus on natural horsemanship would be something special... Starting back with sound basic skills.
Still looking. Any advice welcome, of course ! Will look into Tom Moates (never heard of him, just Parelli method and John Lyons, mmh...).