Affleck, who is currently filming "Justice League" in London, arrived in the French capital on Thursday with Garner and their kids: Violet, 10, Seraphina, 7, and Samuel, 4.
That same day, the family indulged in some sweet treats at the Amorino ice cream parlor, reported People magazine.
"They are so excited for this opportunity for the kids. "He is shooting over there and they will likely come back and forth. He similarly brought the kids to the set during Miracles From Heaven. This is normal for them," a family friend said.
From there, she and the kids went on a tour of the Place de L'Opera, where Garner took photos on her cellphone as a hired guide talked through the history of the famed opera house.
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The "Miracles from Heaven" star and and the kids continued to Montmartre, where the doting mother took selfies with her two daughters and ended up throwing a tired Seraphina across her back as they continued up the last flight of stairs leading to Sacre-Coeur Basilica.
Before arriving in Paris on Thursday, the family spent time in London, with a Twitter user posting that the family was spotted on the Harry Potter tour at Warner Bros Studios Leavesden.
Since announcing their split in June, both Affleck, 43, and Garner, 44, have stressed that they are focused on their children, and have not yet filed for divorce.