But a now series of scandals -- and a new neighbor in the White House -- have ushered in a good dose of gloom.
From bouncer to Prime Minister
His jobs have varied from nightclub bouncer to teacher. A married father of three, Trudeau
is an avid athlete who runs, skis, surfs, boxes -- he's even mastered yoga. And from his shirtless encounters with strangers
to an official visit with a blushing Catherine Duchess of Cambridge, Trudeau has charmed the world one selfie at a time.
Elected to Parliament in 2008, he became Canada's prime minister in November 2015
with a liberal message of inclusion. At age 43, he assumed the office his father, Pierre Trudeau, held decades earlier.
Not so 'sunny': Elbowgate, Castro and chopper rides
The afterglow burned for months. Then came Elbowgate.
It was a jaw-dropping counterpoint to Trudeau's carefully cultivated image of calm. And it was all caught on camera.
In May 2016, while debating a contentious piece of legislation on assisted suicide, Trudeau "manhandled" a member of Parliament
and elbowed another, apparently swearing as he went.
He apologized, twice, and the negative attention was mostly limited to Canada.
No such luck for Trudeau's next misstep.
As the world reacted to the death of Fidel Castro, Trudeau said in a statement
that the Cuban leader had been a "larger than life leader who served his people." He left out any mention of Castro's record on human rights and his history of oppression.
The criticism poured in. #TrudeauEulogies
started trending, with mock tributes to despots past and present. In the end, Trudeau agreed that Castro was a dictator.
Even before that ruckus could die down, Trudeau found himself in the middle of yet another scandal. His office confirmed that the Prime Minister spent his winter holiday on the private island of the Aga Khan -- and used the billionaire religious leader's private helicopter to get there. An ethics investigation is underway.
And no sooner had the new year begun than tragedy struck in Quebec City
, where a local college student allegedly shot to death six men at a mosque. It was one of the worst attacks to target Muslims in a Western country.
Make Trudeau great again
Trudeau used the massacre to double down on his message of inclusion
. "Muslim-Canadians are an important part of our national fabric," he said.
The attack came as Trudeau, aware of his waning popularity and aiming to shed the label of "limousine liberal," embarked on a cross-country town hall road show
He got grilled, heckled and yelled at.
But some commentators saw it as a successful act of contrition after several weeks of damaging missteps.
"That's why he did this incredible tour of the country that no one's ever seen before," said Craig Oliver
, chief political commentator for CTV News.
"He's authentic," said Oliver, who has known Trudeau since childhood. "He has real good instincts about people and about politics."
'Sunny ways' still under threat
As he works to dig out of his domestic rut, Trudeau faces new threats to his progressive politics. There's still a strain of nationalist populism that runs deep in Canada.
Oh, and then there's Donald Trump.
Former Vice President Joe Biden suggested weeks before he left office that Trudeau, along with German Chancellor Angela Merkel, would inherit the liberal mantle
from former President Barack Obama.
"The world's going to spend a lot of time looking to you, Prime Minister, as we see more and more challenges to the liberal international order since the end of World War II," Biden said.
But is Trudeau up to the task?
The Prime Minister is an avowed feminist, free-trader and self-appointed cheerleader for diversity. And just a week before Trump was sworn in, Trudeau issued a thinly veiled swipe
at his new American counterpart.
"There are things that we hold dear that the Americans haven't prioritized," he said at a town hall event. "And I'm never going to shy away from standing up for what I believe in -- whether it's proclaiming loudly to the world that I am a feminist, whether it's understanding that immigration is a source of strength for us and Muslim-Canadians are an essential part of the success of our country today and into the future."
After the Trump administration announced its travel ban on seven Muslim-majority countries
, Trudeau tweeted, "To those fleeing persecution, terror & war, Canadians will welcome you, regardless of your faith. Diversity is our strength #WelcomeToCanada"
"Almost everything that Trump represents, Trudeau resents," Oliver said.
Face to face with Trump
As Trudeau preps for his meeting with Trump, some say he should remember the words of his late father, who in the 1960s said that living next to the United States was like "sleeping with an elephant" -- every "twitch and grunt" affects you.
"Agitating the President of the United States is not a good strategy especially when the President is Donald Trump because he has such a thin skin," pollster Nanos said.
Trudeau and Trump are sure to agree on some issues, including support of the Keystone XL Pipeline
. But for Trudeau, nearly every facet of his country's economy could be affected by his relationship with Trump.
"There's just so much riding on it," Oliver said. "You know, 75% of Canada's goods are sold in the United States. That border has to stay open for business."
For his part, Trudeau said as much last week during a public appearance ahead of his White House visit.
"We both got elected on commitments to strengthen the middle class and support those working hard to join it," the Prime Minister said. "And that's exactly what we're gonna be focused on in these meetings -- making sure that the millions of good, middle-class jobs on both side of our borders that are dependent on the smooth flow of goods and services and people back and forth across our border are reinforcing the deep connections and friendship between Canada and the United States."