Barrett said he’ll be off to “sunny Florida” Saturday afternoon to unwind after a hectic first half to the Knicks’ season. But first he wants to soak in the All-Star vibes. “I want to pick people’s brains,’’ Barrett said. “There’s a lot of stars here. It’s chance to talk to them and see what they do and apply it to my life. I saw Gary Payton last night. He was cool and spoke to us and told us how hard he worked and told us to ask questions. Don’t be afraid to ask questions. People have a lot of knowledge.’’