All Riu's are the same. The buffet you can wear anything you like. All of the specialty restaurants have a dress code. Men must wear closed toe shoes and long pants. Woman - pants, dress, sandals ... anything really goes. Just no denim type thing. However, I have been to many Riu resorts and I have seen lots of people break the dress code and I have never seen someone get turned away. So, they are not too strict ... but best be prepared. Let me know if you have any other questions!