Summer Holidays Special, Get 15% Off Sirenis Hotels And Resorts, Mexico. Grand Sirenis Matlali Hills Resort & Spa Riviera Nayarit, Mexico offers 15% discount with all kinds of services which will make your stay even more comfortable. Terms & Conditions: Stay period is from 1 May 2016 to 14 July 2016. Room Type: Tropical View Junior Suite. Offer valid until 31 May 2016.