During Koizumi's last official visit before he steps down in September, Bush wanted to show his appreciation to their warm friendship by taking the Elvis fan to Graceland.
Koizumi considers Elvis his boyhood idol and is known for breaking into an Elvis routine without needing to be persuaded. He called the trip to the mansion in Memphis, Tennessee a 'dream.'
'It's like a dream. I never expected (the) president (to) come with me to visit Graceland,' he said, referring to the Elvis song, 'The Impossible Dream', before breaking into lyrics.
'My dream came true,' he quipped.
Koizumi was accompanied by Elvis' widow, Priscilla, and daughter Lisa Marie. Bush had the unusual experience of another leader stealing the show.
'I knew he loved Elvis - I didn't realize how much he loved Elvis,' Bush said. 'He not only knows Elvis' history, he can sing a pretty good Elvis song.'
Koizumi has helped raise money for an Elvis statue in Tokyo and put out a compilation of his favourite Elvis songs on CD to raise money for charity.
Koizumi's visit to the United States was for the two leaders a celebration of their warm friendship that began in June 2001 when they played baseball-catch at Camp David. Koizumi's tenure has been marked by the best relations between the two countries in decades.
Bush and Koizumi met at the White House on Thursday for talks on the confrontation with North Korea over its nuclear weapons programme, Iran and Japan's help in Iraq. Koizumi strongly supported Bush's decision to topple Saddam Hussein and sent troops to assist with peacekeeping.
Bush hosted a state dinner in Koizumi's honour Thursday night and poked fun at Koizumi's trademark hairstyle before the two men left for Memphis on Friday.
Bush and Koizumi flew to Memphis together on Air Force One complete with Elvis songs over the loudspeaker. Banana and peanut butter sandwiches, said to be one of the King's favourites, was on the menu for breakfast.
White House spokesman Tony Snow could not confirmed whether the two leaders dined on the unusual combination of fruit and creamed nuts on bread, but said the meal contained '36 grams of fat' and was popular among staffers wearing 'bad sunglasses.'
Snow said the two leaders planned to visit Elvis' 'alleged grave site,' poking fun at conspiracy theories that Presley never died.
After the tour, the two leaders dined on a staple of the Southern diet - barbecue ribs.
Although the media attention on Koizumi's trip was Graceland, Bush and Koizumi discussed important foreign policy issues at the White House.
During a press conference on Thursday, they warned North Korea that it will face consequences by proceeding with the test of a ballistic missile.
'We both agree that it's very important for us to remain united in sending a clear message to the North Korean leader that - first of all - launching the missile is unacceptable,' Bush said.
'Should (North Korea) launch a missile ... we would apply various pressures,' Koizumi said through a translator.
North Korea has reportedly begun preparations to launch a missile, prompting international concerns. Nations in the region are pressuring North Korea to clarify the intention of the test.
'That makes sense, doesn't it? It's a reasonable thing for somebody to do,' Bush said, referring to North Korea leader Kim Jong Il.
Bush and Koizumi also discussed the Iran's nuclear programme and Japan's contribution in Iraq. Koizumi is preparing to withdraw Japanese forces from the country before leaving office in September.
'Japan will continue to provide support and help the Iraqis get back on their feet,' Koizumi said.
