Kocaeli is a city in the Marmara region of Turkey, located in the northwestern part of the country. Here's a guide on things to see and do in Kocaeli: Visit the Kartepe Ski Center: Kocaeli is home to one of the best ski resorts in Turkey. The Kartepe Ski Center offers skiing, snowboarding, and other winter sports activities during the winter season. Explore the Gulf of Izmit: The Gulf of Izmit is a natural bay in the Marmara Sea and a popular spot for swimming, boating, and fishing. Visit the Kocaeli Museum: This museum showcases the history and culture of the Kocaeli region, including artifacts from the Ottoman and Byzantine periods. Walk along the Izmit Promenade: This is a beautiful promenade that runs along the Gulf of Izmit and offers stunning views of the sea and the city. Visit the Kocaeli City Park: This park is a great spot for relaxing, picnicking, and enjoying nature. It features walking trails, playgrounds, and picnic areas. Explore the Izmit Bazaar: This is a traditional Turkish market where you can find a variety of local products, including spices, textiles, and souvenirs. Visit the Seka Paper Museum: This museum is located in a historic paper factory and showcases the history of papermaking in Turkey. Take a trip to Sapanca Lake: Sapanca Lake is located about 20 km from Kocaeli and is a popular spot for boating, fishing, and picnicking. Visit the Gebze Castle: This castle is located in the Gebze district of Kocaeli and dates back to the Byzantine period. It offers a glimpse into the region's rich history. These are just a few of the things to see and do in Kocaeli. The city also has a variety of restaurants, cafes, and shopping malls, making it a great destination for travelers.