If you haven't been there, it's worth a visit. It's a famous spot in Nanjing, always packed with people. As for the boat tour, if you haven't been before, you can take a ride, but it's probably a one-time thing, so the price isn't great. It's a 40-minute round trip on the boat, listening to the announcements, watching the night view of the Qinhuai River, with its many bridges along the banks. You can learn about history, see the waterscape and night view, and soak in the atmosphere.