The President and his friends pay for the private home accommodations that rent for $25,000 per week, however taxpayers – both federal and county - pick up the majority of the bill for the rest of the trip.
Michael Tasselmyer of the National Taxpayers Union Foundation, estimates the 18-hour roundtrip aboard Air Force One, which he said costs $179,750 per hour for flight and operation, will total $3,235,500 for the roundtrip. A Congressional Research Service report released in May 2012 matches that figure.
There are reports the President might also stop on the island of Maui, a 30-minute flight from Oahu, which would add additional expense.
The cost for USAF C-17 cargo aircraft that transports the Presidential limos, helicopters and other support equipment to Hawaii has never been disclosed, but the roundtrip flight time between Andrews Air Force Base and Hawaii is 21.5 hours, with estimated operating cost of $12,000 per hour. (Source: GAO report, updated by C-17 crew member).
The U.S. Marine Corps provides a presidential helicopter, along with pilots and support crews for the test flights, which travel on another C-17 flight. That is $258,000, not including costs for the 4-to-6-member crew's per diem and hotel.