In November, the New York Times reported that some California vacation spots are experiencing a glut of tourists.
As of November 10, the number of people spending $500 or more in one destination rose to 5.6 million, the Times reported.
The number of trips in that price range in 2016 was just over 5 million, but that number rose to 6.3 million by the end of the year.
At the same time, the numbers of people paying $250,000 or more for a single trip in the state jumped to 3.8 million.
The New York report also pointed to the growing popularity of Airbnb, which hosts thousands of travelers for short stays.
Airbnb is a popular way for people to book their holiday vacations in the United States, and the Times notes that it has been a huge growth driver for the industry.
Airbnb was worth $13.5 billion last year, the newspaper said.
It has been growing at double digits since the beginning of 2017, and is forecast to hit $19.2 billion by 2020.