Earlier this year, my sister Elizabeth (also co-host of the Happier with Gretchen Rubin podcast) and I went for a visit to the Golden Door spa in California, and we had a wonderful sisterly time there. So when the Golden Door suggested that I participate in an advertising spread they were planning, I was intrigued—especially when I learned that the photographer was Alexi Lubomirski. Lubomirski is a very well-known photographer who’s perhaps best known for taking the official photographs of…