If you have seven days to explore Adapazarı and its surroundings, here is a suggested itinerary that covers various attractions and activities:

Day 1: Adapazarı City Exploration

- Start your trip by exploring Adapazarı city. Visit the Sakarya Museum to learn about the history and culture of the region.

- Take a stroll in Atatürk Park, a beautiful green space in the city center.

- Explore the local markets and shops to experience the vibrant atmosphere and taste local delicacies.

Day 2: Sapanca and Masukiye

- Take a day trip to Sapanca, a picturesque town known for its stunning lake and natural beauty.

- Enjoy a leisurely walk along the shores of Lake Sapanca and take in the serene surroundings.

- Visit Masukiye, a nearby village famous for its lush forests, waterfalls, and delicious local cuisine. Don't miss the opportunity to try grilled meat dishes at one of the traditional restaurants.

Day 3: Karasu Beach

- Head to Karasu, a popular beach resort along the Black Sea coast.

- Spend the day relaxing on the sandy beaches, swimming in the sea, and enjoying water sports activities.

- Explore the town and indulge in fresh seafood at one of the beachfront restaurants.

Day 4: Taraklı

- Visit the charming town of Taraklı, known for its well-preserved Ottoman-era houses and cobblestone streets.

- Take a walk through the town center and admire the traditional architecture.

- Visit historical sites such as the Hızır Bey Mosque and Çengelhan Rahmi M. Koç Museum.

Day 5: Hendek and Kocaali

- Explore the town of Hendek, known for its natural beauty and agricultural landscapes.

- Visit the Hendek Efteni Lake and enjoy a peaceful walk along its shores.

- Continue to Kocaali, a coastal town with beautiful sandy beaches. Spend the afternoon relaxing on the beach and soaking up the sun.

Day 6: Akyazı and Akçay

- Explore Akyazı, a town surrounded by lush forests and natural beauty.

- Visit the Akyazı Natural Park and enjoy hiking trails, picnic areas, and stunning views.

- Continue to Akçay, a small village with a peaceful atmosphere. Take a walk along the river and enjoy the tranquility of the surroundings.

Day 7: Adapazarı Nature Activities

- Spend your last day in Adapazarı engaging in outdoor activities.

- Visit the Karagöl Nature Park and enjoy walking trails, picnic spots, and beautiful views of the lake.

- Alternatively, you can go rafting or canoeing on the Sakarya River for an adventurous experience.

This itinerary provides a mix of cultural exploration, natural beauty, and relaxation, allowing you to discover the highlights of Adapazarı and its surroundings within a week. Remember to check the opening hours and availability of attractions and activities before your visit.