Travis and his wife Kourtney Kardashian took a ride in a vintage orange truck on the 4th, with Penelope and Reign in the back.

They looked super chill, as they listened to Bruno Mars' "Grenade."

Travis has said he's feeling a lot better after landing in the hospital.

TMZ broke the story ... he had a colonoscopy which triggered pancreatitis -- a serious problem that kept him in a hospital bed for days as doctors ran tests and treated the ailment.

Travis took to social media last weekend and said "I went in for an endoscopy Monday feeling great. But After dinner, I developed excruciating pain and have been hospitalized ever since."

He went on ...  "During the endoscopy, I had a very small polyp removed right in a very sensitive area, usually handled by specialists, which unfortunately damaged a critical pancreatic drainage tube. This resulted in severe life threatening pancreatitis."