Cascais Day Trip - Sunday or Monday?
 

We'll be in Lisbon for 4 full days; Saturday thru Tuesday.

Probably want to save our first and last days for Lisbon in addition to one other.

That leaves Sunday or Monday for Cascais.

There may be more choices of trains to and from on Monday. I imagine being a tourist town everything in Cascais will be open on both both.

Any reason to pick one day over the other to either stay in Lisbon or go to Cascais.

We are not really big museum goers.