Salads are a healthy and filling option for a picnic, as long as they're done right. It is, after all, very easy to make an unhealthy salad. Too often, people weigh down their greens with calorie-filled dressings, such as blue cheese, ranch or Thousand Island, and empty calorie add-ons such as croutons and bacon bits. To avoid this trap, start with freshly washed, leafy greens, then add fresh veggies and low-fat or low-calorie dressing (but wait to toss in dressings until you're at the picnic site, so the lettuce doesn't get soggy). You can also turn a tossed salad into a main dish by adding proteins such as beans -- pinto, black or white -- or a boneless, skinless chicken breast that you've baked and diced prior to leaving the house. If you prefer slaws, try swapping out cole slaw made with high-calorie mayonnaise for a broccoli slaw flavored with light vinaigrette instead.