This trip marks the fourth time that the couple have visited Vietnam since 2006
The two were spotted in Vietnam earlier this week and reportedly spent three days traveling around the country.
On Sunday, the couple visited Halong Bay – a major tourist destination in the north of Vietnam where tourists can boat around a bay filled with limestone rock formations rising out of the water.
Pitt, 51, and Jolie Pitt, 40, were all smiles as they enjoyed a private boat ride along the water together. Later, they showed off their adventurous side, kayaking into caves around the area to get a close look at the beautiful scenery.
“They looked happy,” an observer tells PEOPLE. “[They were] holding hands, laughing.”
After spending the night on the water, they returned to Hanoi where they stayed at the Metropole, a luxurious French-built hotel from the Colonial era.
While in Hanoi they visited the B52 wreckage and spent time in the Old Quarter before leaving the country on Tuesday.
This trip marks the fourth time that the couple have visited Vietnam since 2006.
They first visited the country on vacation in 2006, and returned in 2007 when Jolie Pitt adopted their son, Pax. They later traveled as family to visit Con Dao Islands in southern Vietnam in 2011.
The two are currently staying in Cambodia with their six children as Jolie Pitt films First They Killed My Father: A Daughter of Cambodia, a film based on the memoir by author and human rights activist Loung Ung about the brutal Khmer Rouge regime of the 1970s.
They plan to spend Christmas in the country as well.
The couple’s son, 14-year-old Maddox, who was born in the country, is also involved in the film’s production, along with his brother Pax.
The mother of six previously told PEOPLE that Maddox is helping with research for the film while Pax takes still shots on set.