Oops, I forgot that you were going over there... my excuse is that I had a busy week attending some courses! Sounds like you went via Ryanair - make sure you're back at Central Station on time to catch the coach back to the airport, 'cos a taxi fare is VERY expensive out to Skavsta.

Make sure you spend some time in the Old Town (Gamla Stan)... it'll be tough on your feet, but worth it. Also, don't miss the water, mind you it's everywhere, so you shouldn't!