Csaba Csaki
Google
Amazing hidden gem in Santa Barbara. Due to county regulations there is extremely limited access, so you have to buy tickets many weeks (months) ahead of time, and it's also very expensive ($60/person). However the experience is amazing, and if you can afford it definitely worth it. I would put this in the same class as the other best US gardens I saw, Longwood gardens in PA and the Huntington in Pasadena. It has many different style gardens, some formal European style, cactus garden, aloe garden, Japanese garden etc. You are limited to stay for 2 hours and have to arrive within 15 minutes of your allotted slot.