I love love love Sada! I lived there for two weeks with a local family and it was an amazing experience. The people are so friendly and fun, I met so many wonderful friends! The town is small and easy to get around and right on the beach! It also has one of the best clubs from what I gathered. I went there on a Saturday night and it was packed! Apparently everyone from A Coruna comes down to this club because it is so good! I had an amazing time that night! Also I highly recommend a bar called Moby Dick, we hung around there many nights and had a great time. Also check out the port, especially at night to see all the lights from town! And check out the ceramics factory, it has some really cool stuff at decent prices! And you might even get to meet the famous Diaz Pardo! He took a picture with us and gave us all free cokes!
And then you can still visit A Coruna whenever you want for shopping or to visit the acuarium, Torre de Hercules, or check out a different beach!