The Hop-on Hop-off shuttle service is excellent, allowing you to choose your outbound and return trips according to your needs. If you want to go to Keukenhof on your own, it can be quite inconvenient without a car, but the shuttle is very convenient as you can register and arrange it by taking a free ferry from Amsterdam Central to This is Holland! The garden is also well worth a visit; it's as large as a theme park, with various types of tulips and a flower market where you can buy flowers and seeds. Moreover, the park staff are very dedicated and replace the tulips (they swap out withered flowers with new pots of tulips). If you plan to take photos, set aside about 4-6 hours, as there are also exhibitions to see inside. Two other points worth mentioning: 1) The tulip blooming period is mainly divided into three phases, and the type of tulips you see will depend on when you visit; you can check the official website for details. 2) If you want to buy seeds or potted plants with soil as souvenirs to take home, remember to check the local entry requirements. For example, in Hong Kong, if you want to bring seeds or potted plants that are not native to the region, you are supposed to declare them, and the procedures can be a bit complicated. You can check the customs website for more details.