About 3.7 million people visited Yosemite during 2009, a 9 percent increase from the year before, according to the latest National Park Service statistics. That's the most visitors Yosemite has seen during any year since 1996.
Kings Canyon and Sequoia National Parks also had more visitors last year than during prior years, with almost 1 million coming to Kings Canyon and about 600,000 visiting Sequoia.
It was a little less crowded at Lassen National Park and Point Reyes National Seashore, which both posted small drops in visitors from 2008 to 2009.
Looking to avoid the crowds in Yosemite? Go in February, by far the least busy month, with 79,000 visitors last year. August was busiest at the park: 643,000 visitors.