Concierge.com's insider take:
A mini-railroad connects this quartet of parks—the Grosse and Kleine Wallanlagen parks, the Planten un Blomen flower garden, and the Alter Botanischer Garten—all of which are meticulously well-kept. Within this complex, you'll find ice-skating and roller-skating rinks, restaurants, and gorgeous greenhouses. Planten un Blomen is at its most beautiful on summer evenings. Stroll through the tranquil Japanese Garden (the largest one in Europe) toward the small lake and watch a color light show brighten its waters (49-40-428-232-125; www.plantenunblomen.hamburg.de).