The Osaka Castle Gozabune Boat is a unique way to experience the inner moat of Osaka Castle on a replica of Toyotomi Hideyoshi's golden boat. The 20-minute ride offers a great view of the castle and its surroundings, especially during cherry blossoms season in spring. It's a popular attraction, so make sure to get there early to secure your spot! The boat tours start at 10am but you can buy tickets from 9:30 am.