After delivering a campaign speech, Sen. Barack Obama's first stop on his Hawaii vacation was a visit to his grandmother's Makiki apartment, where he also lived during his youth. Obama -- escorted by Secret Service and accompanied by a few campaign staff and a pool of reporters and camera crews -- arrived at about 4:10 p.m. yesterday and spent an hour with his 85-year-old maternal grandmother, Madelyn Dunham, who helped raise him. He was not accompanied by his wife, Michelle, and two daughters.