Madrid, Vigo, Orense, Spain or Porto, Potugal?

Airline pricing is weird. I am saving about 40% flying into Madrid rather than all the way to Porto for a river cruse. But doing this I am flying in two days early. I figure the day I arrive I will just have an evening in Madrid. Recover from jet lag, get some good tapas, drink some wine. That sort of thing.

So from there I have options for the next day.

Option One: Hang in Madrid for a full day. See the Egyptian temple and whatever Madrid has to offer.

Option Two: take the train to Vigo and see what it has to offer.

Option Three: take the train to Orense. The hot springs seem nice. So far that has the lead.

Option Four: Train all the way to Porto, which goes through Vigo or Orense. That gives me a day in Porto. But the tour already has two days in Porto. So that's my least favorite option.

What do y'all have to say on this dilemma? Total first world problems.