A few of my favorites in Lisbon (and surrounding areas):

Food: Oven Lisboa (Indian and Nepalese), Sem (elevated Portuguese no waste restaurant specializing in fermented foods), Mezze (Syrian), Luka (Asian Fusion), Rhodo Bagels (NY style bagel sandwiches, don’t skip their cookies), A20 (try the pastrami sandwich and specialty coffee), Pomme Eatery (small plates), Las Gringas/Duro De Matar (Elevated Mexican taqueria), Maída (Lebanese), Kefi Greek Bistro, Heim Cafe (cute brunch spot, get there early to avoid a wait), Lupita (naturally leavened pizza), Bibs (cute sandwich shop) The Folks (brunch), Breakfast Lovers, Karater Georgian Bistro, Pita.gr (Greek, located in Caparica), Blitz Pizza (incredible pizza in Caparica)

Dessert: Bike Bakery (best cinnamon roll of my whole life, also great sourdough bread), Fabrica de Nata (pastéis de nata are best eaten hot, their Sintra location is the best and most fresh), Do Beco (slow fermentation bakery & restaurant), Landeau Chocolate (the chocolate cake is out of this world!), Chocolataria Ecuador (despite the name they are made in Portugal), Santini Ice-cream , Gleba (for cookies and fresh bread), Juliana Penteado Bakery, Nivà Cremeria Gelateria Italiana, Alcôa bakery (variety of Portuguese desserts)

Coffee: Fabrica, Marquise da Mobler (aesthetic cafe with lush back patio and good pastries), Empanar (coffee served in artisan ceramics plus organic mediterranean empanadas)

Things to see: Classically Portuguese park Miradouro de São Pedro de Alcântara with beautiful views of the city, Estufa Fria botanical garden, Fundação Calouste Gulbenkian art museum and gardens, Cabo do Roca (do the short hike to the right of the lighthouse for the best views), Boca do Inferno in Cascais, Palácio Nacional da Pena, Monserrate Palace and Quinta da Regaleira in Sintra

Beaches in driving distance: Praia do Ribeiro do Cavalo and Praia das Bicas near Sesimbra, Praia de Galapos in Portinho da Arrábida, Praia da Mata in Caparica