"The summit between the two countries' heads is an attraction, but one which cannot last long if we want to develop travel projects in depth. So we're planning to provide customers with the chance to have meals and hold conferences there," Gao said, adding that costs will rise if these ideas come to fruition.
Travel projects featuring the estate would be launched in August at the earliest, he added.
China International Travel Service is also considering contacting tourism authorities in California to develop travel projects in the US.
"We'd like to enrich our travel lines or projects in foreign countries to satisfy customers, although we haven't been in any consultations about the retreat," said Li Meng, the company's vice-president of overseas travel.
Ji, the Beijing travel enthusiast, said she is looking forward to seeing the retreat. "I'm curious about it, but the beautiful scenery and interesting history are the main attractions for me," she added.
However, Cui Shaoyu, a 25-year-old Beijing resident who works for a media company and will go to the US to study in August, said she prefers cultural or historical sites instead of places that become famous due to celebrities or for hosting meetings between heads of state.
Song Qian, 27, a Beijing resident working for an environmental company who has visited California, said: "Short visits to this retreat will be kind of a waste. I hope to go there for several days with my family."
Zhang Guangrui, director of the Tourism Research Center with the Chinese Academy of Social Sciences, said a retreat like Sunnylands is more suitable for conferences or forums, suggesting that travel agencies consider business trips.
"Some castles and private estates in Western countries are good places for banquets, but are often restricted for visitors," he said.
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