Pres George W. Bush
There are a lot of conflicting figures flying around, but according to my best information it seems to be Bush, who has taken 418 days off so far (even more than Ronald Reagan, or certainly will be more by the time he stands down.) Eisenhower apparently spent 222 days playing golf, but doesn't seemed to have equaled Bush's record. It seems Jimmy Carter spent the most time in the office - about 80 days' vacation.
MR.PRESIDENT OBAMA. If he does another term in office. : )
Bush I think..