In Kotor, Montenegro, there are many exciting and unique things to do:

• Wander through Kotor Old Town (Stari Grad): Explore the fortified medieval walls, historic churches, palaces, museums, and enjoy the vibrant atmosphere with restaurants and live music.
• Hike the Ladder of Kotor to San Giovanni Fortress: It's a challenging but rewarding climb with amazing views of the Old Town and Bay of Kotor.
• Take a Boat Trip: Visit attractions like Our Lady of the Rocks, Perast, Blue Cave, Mamula Island, and more by cruising the beautiful Bay of Kotor.
• Visit Kotor Bazaar: A unique small market inside a Dominican monastery with interesting photo opportunities.
• Relax on Kotor Beach: A palm-lined beach near Old Town with beautiful bay views.
• Visit Cat Square: A square known for its many friendly stray cats, perfect for cat lovers.
• Explore Kotor's Churches: Notable ones include St. Tryphon's Cathedral, Church of St. Nicholas, and St. Luke's Church.
• Visit the Maritime Museum: Learn about Kotor's nautical history and see exhibits of model ships and maritime artifacts.
• Enjoy the lively atmosphere and architecture that reflect Kotor's rich history as part of the Republic of Venice.

These are some top activities and sights to explore to experience the charm, history, and natural beauty of Kotor. You can also join walking tours, engage in water sports like kayaking or paddleboarding, and enjoy delicious local cuisine in the scenic setting of this UNESCO World Heritage Site. If you want a more customized list or details about any specific activities, just let me know! This covers the main attractions and things to do in Kotor comprehensively. If you want, I can also provide practical tips like best times to visit or how to get around.