Hi Elaine,
The Lisbon tour looks very good too!  I visited Lisbon last year - went with friends - and we saw Cintra as well.  I loved the city - great atmosphere and I'd love to go back to Portugal one day.  The Duoro river cruise sounds wonderful as well and hopefully I'll do it a few years down the road.  Whatever you decide, I hope you have a great time!
Cheers,
Bob
Our TM in Costa de la Luz, Gina, is TM for the River Cruise sometimes Bob. She says that it's a lovely trip to do.  I think I have to book early if I want to do Lisbon Coast.  I missed out on it this year which is why I went to Spain.  I couldn't get a sea view with a balcony so passed on it.