visiting boubin forest

Hello, can someone advise me of the best way to get from Cesky Krumlov to Boubin Forest and back to Praha? I just had to spend the night in Ceske Budejovice on the way to C. Krumlov and thought the train attendants had told us exactly what to do to change trains successfully but it didn't work out. So I am trying to find backup information resources if possible. Thanks so much for any help.