Yellow route - Sassagoula River Cruise goes to and from Port Orleans French Quarter and Riverside from the Marketplace Dock.
Green route - services The Landing to and from Old Key West.
Blue route - services The Landing to and from Saratoga Springs Resort
Red route - Disney Springs Water Taxi at the West Side Dock, The Landing Dock and the Marketplace Dock. Route is West Side, Marketplace, and The Landing. This route is open until 1:00am.
So basically from SSR you will take the boat to the Landing, get off and get on a red-flagged boat that will take you to the Marketplace dock. To return from the Marketplace get on the red-flag boat and get off at the Landing and board a blue-flag boat.