Three cheers for Long Island wineries — these days, at least 40 wineries welcome visitors to stop in for tastings and tours. Figuring out where to go is getting to be a challenge. Maybe you want to sit on a North Fork vineyard’s deck with a glass of wine and listen to a little live music. Or perhaps you’re gathering a big group of friends for an afternoon of serious wine-tasting — but you want to bring your own picnic. And a dog. Or your kids. Newsday’s Winery Finder will give you everything you need to know about LI’s wine country.