Nishinomaru Garden is a beautiful part of Osaka Castle Park where you can chill out under 600 cherry trees during the springtime. It's got a cool tea house, a historic guest house, and awesome views of the castle tower. Plus, there's a shrine dedicated to Toyotomi Hideyoshi, the dude who built the castle back in the day. So, if you're into nature, history, and a bit of zen vibes, this garden is definitely worth checking out when you're in Osaka!