I've been to every game since the 2006 one: good weekend away – and this year in June!
I stop in Perpignan (booking own hotel and flights or train), but as cas all the way says, a lot of Cas fans stop in Lloret de Mar (since the 2006 game which was originally supposed to have been in Girona).
CST are good (for transers etc, run coaches from Lloret to the ground and a bus from the centre of Perpginan to the stadium) – and of course help keep this site running by advertising etc