Christie Brinkley at Diamond Ranch
Sara Jaye Weiss/Startraks
Rather than worrying about sharing her two young kids with her ex, Peter Cook
, Christie Brinkley is focusing on "positive things" – and catching waves.
"This summer, my son is really into surfing. So I've dusted off my old surfboard. And I'm out there with him," she told PEOPLE at the 19th annual Wild West Carnival at Diamond Ranch in Watermill, N.Y., for Einstein College of Medicine of her time with Jack, 13.
"I'm mainly getting beat up. Paddling out, when you've got a big set coming, your arms feel like rubber. But you know you're going to get clobbered if you don't keep going."
And as for whether Brinkley, 54, likes the free time that Cook's allotted "parenting time" with Jack and Sailor, 10, affords her, the model said she's "not really enjoying that yet."
"My kids are so much fun to be around," she saids, "and summertime is such a fun time to be with family."
When pressed if reports were true that she had begun dating again, Brinkley demurred, "I'm not even addressing any statements about that ... I don't want to dilute [this charity benefit] with silly little stories about my life."
With the divorce courtroom drama behind her, Brinkley was quick to add, "It's really great to be able to focus on giving back, focus on positive things, and not have to deal with the negative anymore."