You can ride from Penang to Butterworth for nothing, and the return is just 1.2RM. Where else can you take two boat rides for 40 cents?! If you walk quickly off the ferry, you can catch the same return. The views of the harbor are quite nice. On the down side, these are very old boats and the passenger sitting area is in the middle of the cars. However you can walk to the sides for sightseeing while the boat is in motion.