If you are majoring in advertising you should work a summer internship to gain experience and apply the skills and theories that you learned in your classes. So use those foundations in an advertising summer internship.
Get a chance to see what its like in the advertising business and working with clients regarding media buys, print advertising including magazine, brochures and ad copy. Advertising internships could even explore the use of promotional items, television, radio, trade shows, public appearances, direct mail.