kite tourists should be officially called kite terrorists!!!
they have this problem the world over... as a full time travelling kiter i have taken it upon myself at each new place i kite to talk to schools, shops, locals and beach goers for at least an hour before pumping up... Not ever-one at every spot knows every rule... (this can be hard as my German is bad, Spanish well ok, French Non-existent, Italian well i get by...)
pin prick holes in leading edge bladders of Kite terrorists is legal! If they break beach rules!! Black eyes are legal if they do it twice

Sorry you have this problem i've surfed there in 2005 and was a super nice group of blokes there... despite what i've read in mags, forums and newspapers!
hope you get your beach back soon...
when Kobi Ab. is finished with his movie thingy in LA get him and a few lads into kiting and i'm sure the beach will be opened real soon and free of kite terrorists..