Tourism is a major industry owing to the city's climate, its beaches, and numerous tourist attractions such as Balboa Park, Belmont amusement park, San Diego Zoo, San Diego Zoo Safari Park, and SeaWorld San Diego. San Diego's Spanish and Mexican heritage is reflected in the many historic sites across the city, such as Mission San Diego de Alcala and Old Town San Diego State Historic Park. Annual events in San Diego include Comic-Con, the Farmers Insurance Open golf tournament, the San Diego Black Film Festival, and Street Scene Music Festival. Transient Occupancy Taxes (TOT) create funding for the City of San Diego Commission for Arts and Culture.
San Diego County hosted more than 30 million visitors in 2009, of whom approximately half stayed overnight and half were day visitors; collectively they spent an estimated $15 billion locally. The San Diego Convention Center hosted 68 out-of-town conventions and trade shows in 2009, attracting more than 600,000 visitors.
The cruise ship industry, which is the second largest in California, generates an estimated $2 million annually from the purchase of food, fuel, supplies, and maintenance services. Royal Caribbean, Holland America, and Celebrity Cruises have home port cruise ships in San Diego during the winter season. Cruise ship business peaked in 2008. In 2010 the Port of San Diego, which manages the maritime operations of San Diego harbor within the bay, hosted an estimated 152 ship calls and more than 515,000 passengers.