Things to do during your breaks:
Visit the Visitors Center also in Halsey and look at the exhibits, including the mock up of a mid's room. Buy something in the gift shop.
Walk over to look at the Rotunda of Bancroft Hall.
http://en.wikipedia.org/wiki/Bancroft_Hall Midshipmen are on vacation so no noon time formation.
Walk out Gate 1 and down to City Dock, 5 minutes away. Make sure you have id to get back in, and if you are under 16, need to be with an adult to get back through Security.