Holidaymakers in Mallorca, Ibiza and Menorca face chaos this summer with a wave of mass strikes set to go ahead involving hotel staff.The walkout by holiday staff on the Balearic Islands are due to take place during the the peak June and July holiday season and will cause major disruption for tourists.This summer's disruption was planned after the workers' union, UGT, says no progress has been made over their demands for better pay and conditions.