Suddenly they were racing, he laughed and ran after her, She got a head start, that was his excuse for her making it just ahead of him, but when she slowed down ready to shout how she won he was right there, his arms came out to grab her. "Cheater!" he declared, with a laugh, ready to hold her to him and swing her around a bit before pulling them further in the water so he could wrestle with her and hopefully dunk her a bit.
He'd play with her for a while like that, just some fun splashing and such until they were soaking wet and ready to slosh over to the jet ski rental set up, he fished into the lining of his shorts where in a netted pocket was his credit card. They didn't leave any valuables back at the blanket, everything was safe in the car. (better safe than sorry).
He held it up to her and grinned. "So... if I do the rental... does this count as a first date?" he asked her teasingly.