Getting to Lisbon
There is an excellent bus service from Obidos or Caldas da Rainah to Lisbon, that runs almost every hour, for about 6.5 to 7.5 euros each way. This saves the hassle of driving and in particular finding parking. Lisbon is a wonderful city and a day will only allow you to see part of it.
You can catch the bus from either Caldas da Rainha, Obidos or Bombarral but the cheapest way is to drive over the hill from the house into Bombarral to the bus station there as it is on the way from Obidos to Lisbon so the bus journey is shorter & slightly cheaper. There are two bus service providers that travel to Lisbon from Caldas da Rainha, the Rede eXpressos or the rapida verde which terminates at Campo grande in Lisbon.