If you're getting into Adelaide in Feb and staying in the CBD then you can have the best time ever! Right in the middle of Fringe. City is buzzing every single night in the East End and full of tourists and entertainment. Adelaide CBD also has some of the finest dining you will find in this country. One thing we do well here is food. Also you don't have to be a club or pub person....... there are wine bars and other styles of venues for getting together with friends for a drink (by drink I mean alcoholic or coffee or milkshake). I seem to meet a lot of international people here for varying lengths of time on holidays or student visas etc. Many of them come here by themselves and soon make friends and enjoy our lifestyle. One thing I hear a lot is how good our restaurants are and how spoiled for choice we are in such a small area like our CBD. We also have cool places to grab a coffee after wherever you choose to dine. Places like Elephant Walk or Spatz for example.
Seriously, if you are staying in the CBD then stay there as long as you can. In Adelaide thats where everything happens. There are many great restaurants outside the CBD as well.... but not much else as far as nightly things to do. February, March and April are the greatest 3 months on our calendar in my opinion, so you are getting here at the right time.