I have been on the Yarra River Cruise twice. Once to get to Williamstown from SouthBank. The other time it was a 1.5 hour scenic tour of the River starting at SouthBank and going in both directions. My kids got a bit of motion sickness as the waters can get choppy on a windy day. I don't think I would go on a cruise on the Yarra again as there is not much to "see", unless it was a fancy dinner cruise.