I haven't been to F-i-S (yet anyway), but just to say that the Cadiz/Costa de la Luz area is a fantastic place to visit - totally unspoilt and very Spanish (unfortunately unlike some other parts of the country from Gib eastwards. . .). We go there often, usually staying in the Vejer area, although last year we stayed in a delightful apartment in El Puerto just across the bay from Cadiz. Very ethnic, not a Brit in sight and handy for the surrounding area, including Jerez.
Old Cadiz is a magical place to visit too, especially at night. Yes, the restaurants open late but that's half the fun. A tapas crawl through the old cobbled streets in the Old Town is one hell of a way to spend an evening - very, very civilised indeed.
If I was going there for training or hour building, I'd resist flying all day and then retreating to my hotel room come night time; get out and see something of the place whilst you're there. The locals are extremely friendly and will make you feel very welcome, especially if you're on your own.
HW