Barcelona - day trip to a Cava Vineyard?
Remember you need to go on a weekday so either Friday or Monday would be best for you. That said the sure fire visits are to the big ones, Freixenet and Codorniu, both a good time and well laid out visits. The best part too is that if you don't have a car you can do these by train that leaves from the SANTS station fairly regualarly. Should take about a 1/2 hr to get there. if you go in the morning you could even try to make both wineries with a lunch in between in downtown Sant Sarduni d'Anoia
It helps a ton if you call a head to confirm your visit. Both wineries can be found via google! Codorniu's contact info can be found here: http://catavino.net/story-map