I'll be visiting Sintra for a full day trip (maybe on a Wednesday or Thursday) from Rossio train station in Lisbon and returning in late afternoon/early evening. What times do the trains back to Rossio station leave Sintra station and how frequently? Also, when you arrive at Sintra station how far are the castles etc from there? Are they well signed posted? And are the three main attractions (Palacio Nacional de Sinatra, Palacio Nacional de Pena and Castelo dos Mouros) near to one another (ie. within pretty easy walking distance to each other?) If not, are there any buses that'll take you from one to the other? Finally, what are the opening times to these places?
Thanks for any help and input!