Of course, the focal point of all Dutch tulips cruises is a visit to Keukenhof, one of the world’s largest flower gardens, with nearly seven million bulbs planted annually. Open only eight weeks a year, from the end of March through mid-May, the park welcomes approximately 800,000 visitors to explore nearly 80 acres of gorgeous tulips, hyacinths, daffodils, orchids, roses, carnations, irises, lilies, and more.