If you want to cruise the Seven Seas Lagoon near the Magic Kingdom you would have to rent a watermouse at the Grand Floridian or the Polynesian or the Contemporary or Wilderness Lodge or Fort Wilderness. Go to any of those resorts and go to the marina, you don't have to be staying at those resorts to rent them there. You can rent them at CBR but that lake is not connected to the lake near the Magic Kingdom.