The High School Musical alum shared a rare glimpse into his private life, posting photos and videos from a recent trip to California's Lake Nacimiento with his younger brother Dylan Efron.

One snapshot posted to Instagram Sept. 10 showed the siblings baring their washboard abs on the back of a boat, while Zac, 38, rode the waves on a small surfboard in another image. In a third photo, the Iron Claw star and Dylan, 34, soaked up the sun with friends.

While Zac captioned his post with a peace sign emoji, Dylan—who shared similar pictures from the lake getaway—wrote on his own Instagram, "Taking it easy."

Indeed, Zac has been breaking free away from spotlight, making just a handful of public appearances in recent years. That's why when he made his long-awaited entry into the Dancing With the Stars ballroom in November to support his brother, it "meant everything" to Dylan.

"I grew up watching him do stuff like this," the Traitors winner told E! News at the time, "so the fact that he's now watching me do this is crazy to me."

So, what has Zac been doing during his downtime? Building a sustainable home in Australia, which he's enlisted designer Joost Bakker to create primarily out of cannabis plants.

"I've lived just about everywhere you can for several months or even years at this point," Zac told the Australian Financial Review in December. "And I think if I had to look back at my whole life and think where do I ultimately want to end up, every time I go to Joost’s I have a sense of ‘this is actually what I want in life.'"

"It just seems right," he continued of his dream house, which sits on 128-hectare (about 316-acre) of land near the New South Wales and Queensland. "Like, that’s the way it should be done."

For a closer look at Zac's home life with his family, read on.

Zac Efron posted this adorable photo of him reading a book to little sister Olivia in February 2023, writing on Instagram, "My valentine."

Zac took Olivia and his youngest brother, Henry, to the circus in June 2023.

The High School Musical alum visited Circus Vargas with his siblings and dad David Efron.

Zac bonded with his brother Dylan Efron on a late summer 2023 trip.

In a June 2021 Instagram post, Zac called Olivia a "little heartbreaker."

Zac and his younger brother Dylan cuddled some baby goats in June 2018.

The Efron brothers checked out a Los Angeles Dodgers game on August 24, 2016.

Zac posted this brotherly photo in honor of Dylan's 31st birthday in February 2023, writing in the caption, "Here's to many more years of shared adventures and endless good times. Love ya!"

The actor shared an adorable moment with Olivia on her birthday in December 2022.

"Happy bday lil sis," he captioned this sweet snap.

Zac greeted Dylan at the finish line when he ran the Nautica Malibu Traithalon in September 2016.

The Baywatch star rode bikes with Dylan during a sunny outing in Los Angeles in June 2017.

Zac and Dylan went camping in the family's new van in July 2017.

They're all in this together! Zac marked Dylan's birthday in February 2022 with a hilarious tribute, reading, "HBD lil bro! 30 years and we're still up to the same $&!+."