Must see:

• Oldest Bookshop in the world - because bookstore - https://en.wikipedia.org/wiki/Livraria_Bertrand
• The Most Beautiful Bookstore in the World - need I say more - https://www.livrarialello.pt/en/home
• Lisbon Maritime Museum - for Portuguese maritime history - https://www.lisbonportugaltourism.com/guide/maritime-museum.html
• National Museum of Ancient Art - sounds so cool - http://www.museudearteantiga.pt/english/
• Belem Tower - Looks beautiful - https://en.wikipedia.org/wiki/Bel%C3%A9m_Tower
• São Jorge Castle - I want to see a Portuguese Castle to contrast with Germanic ones - https://en.wikipedia.org/wiki/S%C3%A3o_Jorge_Castle
• Jerónimos Monastery - omg this looks like the most gorgeous monastery I've ever seen - https://en.wikipedia.org/wiki/Jer%C3%B3nimos_Monastery

--- Food Options:

• LxFactory - https://lxfactory.com/en/homepage-en/
• Time Out Market - https://www.timeoutmarket.com/lisboa/en/