"My family took me down to South Texas and we camped out on the river that I learned to swim in, the Frio River," McConaughey told ET's Nischelle Turner at the Hollywood Film Awards in Los Angeles on Sunday. "It was cold but it didn't matter. We swam in that Frio River, took the rope swings all through the river all day.
"We barbecued outside and played music, my son DJ'ed, we cooked steaks and had a great time," he added.
A day after being honored as the birthday boy, McConaughey was in the spotlight once again at the Hollywood Film Awards, where he and the cast of his new film, Gold, were honored with the ensemble award.
In Gold, McConaughey plays Kenny Wells, a down-on-his-luck businessman whose fortune changes when he teams up with a geologist (Edgar Ramirez). Together, they discover a dense vein of gold deep in the Indonesian jungle.