When Jim mentioned this, Rebecca suggested, "Wait a minute. Why don't you just tell him that, while we were walking around, we just ran into Beth. And then you two got to talking, so that you didn't need to pretend to be someone else. It also makes it easy to say that she needed to leave early, so you had to get an early meal, which makes it more plausible for me to be waiting around for you."
"That's brilliant, Becca," agreed Jim. "But you should still look like Beth around me, just in case we run into people we know."
Since they hadn't yet gotten out of the car, it was easy to do that immediately. And since she could, she decided to make her clothes a bit flashier in the process.
Jim looked, when she stood up, and said with a smile, "If you want me to keep my hands off, that is not the way to do it."
"You better keep them off," she replied, walking towards the entrance with emphatic wiggling of her hips.
Starting slowly after, Jim agreed, "Ok, I'll just walk five steps behind you, and enjoy the view."
She stopped and waited for him to catch up; when he did, she punched him in the arm. "That's not nice," she said, though she was smiling as she said it.
He put him hand out, she took it, and they walked inside.