One of your first stops should be Mandurah Visitor Centre. Here, you'll be able to orient yourself and pick up some great ideas before you begin exploring.
You'll be spoiled for sightseeing choice in Mandurah. Mandurah Visitor Centre is an ideal place to begin here, but there are lots of other worthy places to explore. Mandurah Performing Arts Center, King's Carnival, and Meadow Springs Golf Club are close to the tourist information center and will fill in your day nicely.