Tourist are suggested to come by KTM. If from KL Centre KTM station, it takes about 1 hours 15 minutes  to reach the Port Klang terminal, ( RM4.30 one way)

  You will see the jetty a few meter away at right-hand side on arrival.

link to KTM Kommuter Route map 

   If you are driving from KL, easily use Federal Highway, and follow the sign board to Port Klang (South Port). Car parks are available at KTM Terminal, in front of the police station and private company's parking lots.