Day 1 - Historic Hamburg: Morning: St. Michaelis Church and Town Hall Square. Afternoon: Explore Old Town streets and Deichstrasse. Evening: Harbor view from Elbphilharmonie terrace.
Day 2 - Museums & Culture: Morning: Hamburg Art Gallery. Afternoon: Miniatur Wunderland (book tickets ahead). Evening: Dinner in Speicherstadt.
Day 3 - Waterfront & Entertainment: Morning: Port boat tour. Afternoon: Walk through Speicherstadt warehouses. Evening: Entertainment on Reeperbahn in St. Pauli.
Day 4 - Nature & Relaxation: Morning: Planten un Blomen botanical gardens. Afternoon: Bicycle ride along Elbe parks. Evening: Sunset viewing from Elbpark.
Day 5 - Day Trip: Explore Lüneburg's medieval town and salt mines (1.5-hour train ride), or visit charming harbor town of Stade.