The Riverwalk is right behind the Riverside hotel where my wife and I stayed for five consecutive nights.
One evening we took the water taxi. Stop #9 is only 1.5 blocks from the Riverside hotel. I highly recommend the water taxi in order to get a true feel of Fort Lauderdale. The water taxi is only $20 pp for the entire day or $10 pp after 5:00. The water taxi makes 12 stops with unlimited on/off privileges.