JAY-Z, Beyonce and Blue Ivy step out for a yacht cruise in Miami  After a string of performances around the Gulf Coast region over the past week, JAY-Z took a break from work for some R&amp;R with his family. On Monday Nov. 13, the Roc Nation exec was spotted on a chartered Petrus yacht in Miami with Beyonce and their 5-year-old daughter, Blue Ivy. The high-profile fam spent about two hours sailing around the bay and sharing some lunch with friends on the boat, according to the Daily Mail. The…