You can experience a blend of cultural, historical, and scenic sites for a one-day visit to Beirut that optimises a layover. Here's a streamlined itinerary that focuses on the essentials, accommodating the flexibility needed for layover timing:

Morning: 1. Start at the Beirut National Museum - Open from 9:00 AM, it's an ideal first stop, especially on hot days, offering a fantastic retreat while immersing you in Lebanon's archaeology and history. Spend about 1-2 hours here.

Midday: 2. Explore Hamra Street - Head to Hamra Street around lunchtime. This vibrant street offers numerous dining options where you can enjoy Lebanese cuisine. Explore the shops and get a feel for Beirut’s modern life. You'll want to allocate about 1-2 hours here.

Afternoon: 3. Visit Zaitunay Bay - After Hamra, take a short drive or a taxi to Zaitunay Bay. Enjoy a leisurely walk along the waterfront, maybe have a coffee or snack at one of the cafes, and soak in the Mediterranean views. Spend around 1 hour here.

Late Afternoon to Evening: 4. Raouche Rocks at Sunset - Conclude your day at Raouche Rocks. It’s best to arrive here at least an hour before sunset. This will allow you to enjoy a walk along the Corniche and find the perfect spot to watch the sunset behind the rocks, a truly iconic Beirut experience.

Optional Adjustments: - If time is limited, you can skip Jeita Grotto. While its stalactites and stalagmites are impressive, the travel time to and from the grotto may not be practical on a tight schedule. - If you have extra time, or if your layover extends into the evening, consider exploring Beirut’s nightlife, especially around Hamra Street or back at Zaitunay Bay, where many restaurants and bars come alive after dark.

Practical Tips: - Transportation: Arrange for a taxi or a rideshare service for the day to save time. Public transportation may be less reliable for a tight schedule. - Weather Considerations: Beirut can be quite warm, so it is advisable to visit indoor locations like the museum during the hottest part of the day. - Luggage: Check with your airline to see if they offer layover luggage solutions or use luggage storage services at the airport.

This itinerary offers a good mix of indoor and outdoor activities, cultural immersion, and relaxation, all tailored to make the most of a brief visit to Beirut.

The images are designed to serve as an idealized visual aid for planning and inspiration, not as precise representations of the actual sites.