SURF’S UP: With fashion week nearing its close, some weary showgoers are checking the weekend weather forecast for one last blast to the beach. Nicole Miller is already on it. The designer packed up her design team and whizzed them out to Long Beach, N.Y., Wednesday for some surfing. Adept at all sorts of board sports, Miller also wakeboards and will be doing a charity kiteboarding event in the Hamptons Sept. 20. Her team’s day at the beach Wednesday was more relaxed, since it was first and foremost a “preshow treat,” she said.