A quick dinner at the rented house he shared with his parents, Gerry and Rosie, and friends including his "bestest", Harry Diamond, and it was on to a Liverpool nightclub, where he met up with Justin Rose and Jordan Spieth.
It was there the 30-strong group had their fun with the jug, replacing the traditional claret with the German liqueur popular on the younger scene.
Yesterday he went home, crossing the Irish Sea by ferry and although his compatriots will be desperate for him to salute his success in their traditional way, McIlroy is determined that the felicitations will not carry on for too long.
The golfing bug has returned for him, and he cannot wait to resume reclaiming his sport's summit, starting next week with the World Golf Championships-Bridgestone Invitational.
Those close to McIlroy talk of him being "re-engaged" after losing his focus during the previous year or so. Within Team Rory, they call his concern-free, blessedly natural style "Rory golf", and although the inner circle accepts that the golfing gods giveth and taketh away, they are confident his standard is so high again that he can only carry on winning.
His rivals should beware, not least Adam Scott, who could lose his No1 tag to McIlroy in Akron.
The Australian may wish to seek out the naysayers who snapped McIlroy back into his groove, just as they did at the 2011 US Open after the grim months which followed his Masters meltdown. Certainly, McIlroy sees the similarities.
"My first major at Congressional was maybe about silencing some of the doubters and battling the demons I had in my own head," the Northern Irishman said.
"And since the start of 2013 it has been a difficult 18 months at times - winning the Claret Jug makes it all worthwhile ... I maybe had to silence a few doubters about how I play links golf, how I handle a lead and how I play on a Friday.
"I felt like I could do it. I'd had the win [in the BMW PGA Championship in May] at Wentworth, my game was in good shape and I was just coming into form. I just needed something to click. Luckily everything clicked at Hoylake."
It did click, but not without the odd clunk.
McIlroy was forced to prove his mettle when Sergio Garcia, the major's eternal bridesmaid, made his charge at the altar down the stretch, reducing a seven-shot lead to two. Watching in Ohio, Jack Nicklaus was impressed by McIlroy's nerveless game-management which, over the years, has been frequently questioned.
"The other guys put the pressure on him with what they did," Nicklaus said. "Rory then did what he had to do. That is the measure of what you are doing. It is not to go out and shoot another 66. It's shooting what you have to shoot to win the golf tournament.
"I like his swagger and I like the way he handles himself. I like his desire to be great. I like his desire to do the things he needs to do. I like that in a young guy. He's cocky in a nice way."
That could be the perfect description of McIlroy - "cocky in a nice way". When he was growing up, he would make pronouncements about a garlanded future and even when he disrespected the Ryder Cup or declared he would like to play an out-of-form Tiger Woods, there was something inoffensive in his tone.
Yet, as Nicklaus says, the desire has always been there and that is why his shock at his standing in the game as the third-youngest to win three of the four majors is so intriguing.
McIlroy is ahead of even his own highly ambitious career path.
"When I used to think where I wanted to be when I was this age or that age, by the time I was 25 I wanted to be an established Tour player and maybe have won a major or have had chances to have won majors and Tour events," McIlroy said.
"So to be going to Augusta next year as a 25-year-old with the chance of completing the career grand slam - well, even I wouldn't have thought that would be was possible."
McIlroy is considering taking some R&R in New York City at the weekend before going to Akron next Wednesday for the next test against the world's top players. That and the major at Valhalla a week later are more than conveniently scheduled in the refocusing the mind.
"I am going to take this week to enjoy what I have done, to enjoy the success that I have had and then try to get myself ready for the WGC Bridgestone and then the USPGA," he said. "There are so many challenges ahead I can honestly say I've never been this excited."
One of them probably is not the 18-hole rematch offered by former President Bill Clinton. McIlroy enjoyed a round with Clinton in Dublin last October, but the old boy may now have to wait in turn. Telegraph Group Ltd
