If you must see them, then be warned they are a big tourist trap......located just ouside Sydney, these stadiums must have been something when the Olympics were here in 2000, but now there just empty buildings......I passed on the tour, but my other friends didn't and when they came back they told me it was boring and there was not much to see other than some empty stadiums !!!!! then I said the famous words "I told you so"
The Olympic Park is an interesting place, but also a tourist trap. If one arrives by ferry (to Homebush Bay), I would suggest taking the 401 bus. It's a lot cheaper than the $10 Olympic Explorer bus and goes to the same place. Once you get there, you can walk around to see the different stadiums.
homebush.. the site of olympics 2000.. i guess this is very much to personal taste.. i was there just a couple of months before the big event and i didn't quite enjoy it.. it's stadiums after stadiums.. without the crowd and cheers, it's quite monotonous.. and we had to pay to get in to homebush bay.. then pay again to enter each stadium.. :P but then again, i suppose if you're into the sports thingy, you'll love this..