Sharks or syringes, forget about it. That would totally ruin a beach vacation.But people are more placid about poo, apparently. Although a raw sewage spill prompted authorities to ban swimming at three of the busiest beaches in Ocean City, N.J., earlier this week, sunbathers crowded back into the ocean Tuesday afternoon, after Cape May County health officials declared the currents safe. "Considering that Ocean City is seven miles long, I think it's a little bit overblown," said John Millon, 56, of Havertown, who spent Tuesday on the beach at Third Street. Millon, who has a house in Ocean City, swims in the ocean daily and didn't think the sewage scare would keep him on the sand.