PCB is ok when its not spring break. Lots of stuff to do as well as nice clean beaches (or was last week).

Jacksonville is also nice

If you are not stuck on Florida. Then Saint simons island is a nice relaxing place. Its not the typical beach scene it is more of a weekend getaway then a vacation resort. Very calm and not so crowded like other places. It is a very calm vacation. And if you dont like it too much jacksonville is only like an hour away.