Here are some top things to do in Tallinn:

• Visit Tallinn's Gothic Town Hall and enjoy concerts and tours in the medieval Old Town center square.
• Explore the Estonian Open Air Museum featuring a historic fishing village and walking trails.
• Go to Tallinn Zoo, home to a wide range of animals in modern enclosures.
• Check out the Estonian Maritime Museum "Fat Margaret" with exhibits on seafaring history and city views from the rooftop.
• Stroll through Vabaduse väljak (Freedom Square), a historic square with modern cafes and art galleries.
• See the Viru Gate, twin ivy-covered watchtowers marking the entrance to Old Town.
• Enjoy panoramic views from Kohtuotsa viewing platform overlooking Old Town.
• Visit the Estonian Art Museum (KUMU) showcasing Estonian art over two centuries.
• Walk the well-preserved Tallinn City Walls and visit Kiek in de Kök museum and bastion tunnels.
• Explore Toompea Castle and the Governor’s Garden.
• Admire the Alexander Nevsky Cathedral with its beautiful Russian architecture.
• Experience the creative vibe at Telliskivi Creative City with street art, galleries, and shops.
• Visit Kadriorg Art Museum inside Kadriorg Palace, a baroque palace built by Peter the Great.
• Discover Fotografiska Museum, a modern photography museum located in Telliskivi.
• Visit the Seaplane Harbour Maritime Museum with a submarine and interactive exhibits.
• Stroll through Kadriorg Park, an extensive park with art museums and beautiful paths.

These activities offer a mix of history, art, nature, and unique local culture to enjoy in Tallinn. Many attractions are family-friendly and accessible. This list gives a great overview for both short and longer visits to Tallinn. If you want more detailed info on any of these or specific recommendations, feel free to ask!