Much has been made of today’s college students’ social responsibility, their great relationships with their parents, and their eagerness to collaborate and succeed in the real world. But there’s one thing these so-called millennials still share in common with their gen-Xer ideological counterparts: When it’s spring break, it’s time to let loose. Thousands of area college students have headed off to the beach this month, seeking Florida, the Dominican Republic and Cancun, Mexico as top destinations. The University of Maryland turned into a ghost town Friday afternoon, when even the Washington region’s balmy weather couldn’t compare with boarding a plane southbound. George Mason University and George Washington University students return to class Monday, and Georgetown students just finished their first week back.