I am actually going to Adelaide for game 1 with some mates to make it a 3-4 day trip away.
Got return flights for $360 from Sydney to Adelaide.
$180 at 8am flights on game day with Qantas is a bargain. I reckon they will be $400-500 early next year.
Never been to Adelaide so origin has given me the excuse to go there.
I like Adelaide, you will enjoy it .Flat city (in terms of the terrain) Been a couple of times on Australia day for ODIs. Though never been recently with the new revamped stands and new ones added
You will see the best and variety of catering literally just outside Adelaide oval. Have a feed there. Its great. *Though I am sssuming it will be a similar set up for Origin as is for the cricket?
If you have some time and want to do something different, Haigs chocolate factory tour is pretty good (I think you still need to book online and it s free). They give you a few free samples, and a good tour into the making of them (and a good speel on why they will never go into a chain like Coles/Woolies). The Himenji (japanese) garden is a lovely stroll. near Haigs, not overly big but a nice calm and peacefull place to be
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Some good pubs/bars on Glenelg beach. Take the free tram ride directly there from the CBD and check it out. I found quite a few souvenir shops in Glenelg, if thats your thing..