With an 8-hour layover in Doha, you have enough time to leave Hamad International Airport (HIA) and explore the city's highlights. The most efficient way is to book a "Discover Qatar" transit tour, which whisks you to the Souq Waqif (a traditional market), the Doha Corniche, and the Katara Cultural Village. If you prefer to go solo, the Doha Metro is incredibly fast and clean, taking you directly to Msheireb Downtown or the Museum of Islamic Art (MIA) in about 20-30 minutes. If you arrive late at night or don't want to clear immigration, HIA itself is a destination; you can visit the "ORCHARD" (a massive indoor tropical garden), take a photo with the famous 23-foot yellow "Lamp Bear," or pay for access to the Vitality Wellbeing & Fitness Centre to use the indoor swimming pool and gym. Eight hours is the "perfect" window—long enough to see the skyline and grab some authentic Qatari Machboos, but short enough that you won't need a hotel room. Just ensure you are back at the airport 2 hours before your departure to clear security.