A Wifi connection is a growing demand for campers within Spain and many campsites are fulfulling their clients requests. Many have already installed Wifi which is available around the reception area and some are going that little bit further.
One example is Camping La Marina that has announced in 2012 in will offer free Wifi throughout the entire site usuing WIMAX technology for which some users may need a special adaptor. For a site of 60.000 m2 with 345 pitches and 36 bungalows/mobile homes that´s quite a feat.
It is really encouraging to see so many campsites adapting to what today´s client wants. I know around 80% of the 21 sites I inspected in 2011 had Wifi available and mostly for free. Small sites, large sites including very rural sites realise it´s necessity these days.