Daddy duty! Mark Zuckerberg lugs around with a toddler's potty to a burger restaurant as he enjoys his month-long paternity leave in Hawaii (Details, pics)

Mark Zuckerberg may be a billionaire but he's not above lugging around his toddler's potty training seat.

The Facebook founder was spotted in Hawaii on Thursday, carrying his daughter's training toilet and sippy cup after having lunch at casual burger joint Bubba's in the town Kapaa on Kauai.After lunch, Zuckerberg was seen smiling as he carried two massive cups of Hawaiian shaved ice.

Earlier this month, Zuckerberg announced that he would be taking the month of December off for paternity leave. Zuckerberg and his wife Priscilla welcomed their second daughter, August, in August. Their first daughter, Max, turned two earlier this month.

The warm Hawaiian weather meant that Zuckerberg ditched his usual black hooded sweatshirt in favor of a purple t-shirt, black gym shorts and Adidas sandals.

Zuckerberg was seen chatting to a male friend during the outing, who was similarly casually dressed, wearing navy Crocs. He showed some Bay Area pride by wearing a Golden State Warriors hat.

His wife Priscilla also went out to lunch, looking a bit more put together in a chambray top and pearl earrings.

The restaurant is about 10 miles from the 700-acre former sugar plantation that Zuckerberg and his wife bought for $100million in 2014.

Zuckerberg drew the ire of locals last year, when he attempted to acquire 14 parcels of land that bordered their already sprawling property.

The land had been granted to natives in the mid-19th century, and because many of the owners died without wills the lots now have hundreds of owners, and many are not even aware of their stake in the property.

Zuckerberg petitioned the court to try and identify the owners and then auction the land, a move some equated to stealing from natives.

When Zuckerberg's real estate move was criticized in the press, be backed down, saying they would look for alternative means of working with the locals.'

We've heard from many in the community and learned more about the cultural and historical significance of this land.'

Over the past week, we've spoken with community leaders and shared that our intention is to achieve an outcome that preserves the environment, respects local traditions, and is fair to those with kuleana lands,' Zuckerberg wrote in an op-ed for The Garden Island.

He added: 'To find a better path forward, we are dropping our quiet title actions and will work together with the community on a new approach.'

We understand that for native Hawaiians, kuleana are sacred and the quiet title process can be difficult. We want to make this right, talk with the community, and find a better approach.

'The land is made up of a few properties in Waipake, Pila'a, and several kuleana within them. As this community knows, the history of this land is complex. Many of you have shared your families' stories, and we want to honor their history.'

Zuckerberg then took some time to pat himself on the back by pointing out that the land he purchased would have possibly become a development had he not swooped in and picked up the property.

He pointed out that same fact back in July when residents grew upset with the massive stone wall he erected around his land, which eliminated views of the water for some and created problems with beach access.

A section of the property called the Kahuaina plantation had been subdivided for 80 luxury homes prior to Zuckerberg's purchase.