The meeting point at the left entrance to Jardins do Palácio de Seteais (Next from Quinta da Regaleira). You can recognise your guide by red bandage on the bag or backpack.
You can get here by bus 1253 from train station, by walk from old village (15 min) or by taxi.
End point - the old village of Sintra where you can stay for a lunch or to take any transport to keep discover the region.