Sounds like a fun outing! If we aren't cooking usually we'll go to a local deli we love and get pints of our favorite things. Also fried chicken travels well if you're feeling a little greasy, or grilled chicken with beans, rice, & tortillas.
You can make chicken salad in pitas or lettuce cups, just grill/cook some chicken & cut it, & mix it with what you like. We love curry chicken salad with chopped cashews & grapes...okay I'm getting hungry!
Do they sell jicama where you live? A good and easy salad is jicama, mango, and cucumber with some lime, chili, and red onion.
We picnic a lot and I love making these sandwiches, if you end up going the sandwich route try them they are yummy! (recipe from Dean & Deluca)
Goat Cheese, Avocado, and Turkey Sandwich on Nut Bread
An ideal picnic sandwich, especially when a crisp, cool bottle of Sancerre or Pouilly-Fumé is at hand.
Ingredients:
3/4 pound tomatoes, finely minced (about 1 cup)
1 tablespoon finely minced scallion
2 heaping tablespoons finely minced cilantro
salt and freshly ground pepper to taste
12 slices nut bread, each about 1/3 inch thick, 3 inches wide, 6 inches long (this is easiest to achieve if you cut the bread from a round loaf)
12 ounces goat cheese
12 thin slices of smoked turkey breast (about 1/2 pound)
2 medium avocados, peeled, pitted, and cut into thin slices
Directions:
1. Mix together the tomatoes, scallion, and the cilantro. Season to taste with salt and pepper.
2. Spread each of the 12 bread slices with 1 ounce of goat cheese. Top 6 of the slices with a slice of smoked turkey. Top each turkey slice with one sixth of the tomato mixture, spreading evenly. Top that with a thin layer of avocado slices, seasoned with salt and pepper. Top with the remaining slices of turkey, and cover with the remaining 6 slices of bread (which have been spread with goat cheese). Cut each sandwich in half.
Don't fret over slicing the bread exactly in this great sandwich recipe—or even the exact proportions of ingredients. What follows is a guideline. But any combination of these ingredients on any slice of nut bread is going to yield a great sandwich. Makes 6 sandwiches
Also, someone sent me this NY Times picnic list, really good stuff and easy:
http://www.nytimes.com/2008/07/02/dining/02mini.html