San Diego is the sixth-largest city in the country with a population of 2.7 million people.  San Diego is best known for its "perfect" weather and world-class tourist attractions. That is why San Diegans call it "America's Finest City." San Diego enjoys a mild climate with day-time highs seldom exceeding 80 degrees or dropping below 60 degrees.  Just about every day is pleasant, and San Diegans can play tennis, golf, swim, bicycle, rollerblade and do every other outdoor activity imaginable under the sun year-round. San Diego's 70 miles of beaches are like a family of diverse people -- each has its own personality.  Some are havens for surfers and divers, others are remote getaways, and many are perfect for most any activity. San Diego attractions include the world-famous San Diego Zoo, Sea World, Legoland, Gaslamp Quarter, and Wild Animal Park.