Here's a suggested travel itinerary for your trip to Lisbon and Estoril:

### Day 1: Arrival in Lisbon
- Morning Arrive in Lisbon and check into your accommodation
- Afternoon Explore the historic neighborhood of Alfama and visit São Jorge Castle for panoramic views of the city
- Evening Enjoy a traditional Portuguese dinner at O Tasco Do Vigário for an authentic dining experience

### Day 2: Lisbon Exploration
- Morning Visit Belém to see the Belém Tower, Jerónimos Monastery, and taste the famous Pastéis de Nata at Pastéis de Belém
- Afternoon Stroll through the colorful streets of Bairro Alto and Chiado, and visit the Santa Justa Lift for a bird's eye view
- Evening Indulge in a seafood feast at Ramiro for a quintessential Lisbon dining experience

### Day 3: Day Trip to Sintra
- Morning Take a day trip to Sintra to explore the fairytale-like Pena Palace and the historic town center
- Afternoon Visit Quinta da Regaleira and explore its enchanting gardens and underground tunnels
- Evening Return to Lisbon and dine at Invicta Madragoa for traditional Portuguese flavors

### Day 4: Travel to Estoril
- Morning Travel to Estoril and check into your accommodation
- Afternoon Relax on the beach and enjoy the coastal views
- Evening Experience a beachside dinner at a local seafood restaurant

### Day 5: Estoril and Cascais
- Morning Explore the charming town of Estoril and visit the Estoril Casino
- Afternoon Take a short trip to Cascais and wander through the historic center
- Evening Attend the Cascais Christmas Village for a festive atmosphere and holiday