While in Lisbon, beware of the slippery granite walks. I nearly fell twice. Wear shoes with gripping soles.

We visited the tile museum in Lisbon, which is in an ancient convent building.

I'll give you one suggestion.

If you plan to visit. the S. Jorge Castle, you can combine that with a walking-around tour of the Alfama district and dinner at Audrey's. It's about halfway down the hill from the castle and next to the Hotel Santiago. If the weather is nice, you can sit outside. If not, the inside dining room is quite nice. Good local food selections and excellent service. Save room for the pavlova dessert. (One will be sufficient for two of you.) Make reservations.

BTW, if you're staying in central Lisbon, the 737 bus from the city center has a stop right at the castle. Then you can catch the same bus at the castle to return to the center.