Food perfect for picnics?

Fresh fruit salad is good, especially in the summer.

Mini pizzas with various toppings. Salads.

Take a wasp trap.

hand pies, sandwiches and finger food are all good. Stuff which doesn't ooze sauce or grease, doesn't require cutlery (heavy to carry) and limits the number of dirty dishes you'll need to stack and carry home.

I like making a courgette and egg pie - layer thin slices of green and yellow courgette and onion in a pie, pour over with beaten egg and a little milk and salt, add grated cheese, top with a crust and bake. Solid inside while still moist throughout so it doesn't need a sauce. Also good are drumsticks and anything on a stick.

There's quite a few handy options here... http://www.bbc.co.uk/food/occasions/picnic

Here, too...

http://www.channel4.com/4food/recipes/seasonal/picnics

Avoid food poisoning. That means either pack things in ice or take things that last longer without refrigeration, or picnic in a place where you can grill things. If your stuff is refrigerated prior to packing and the air temperature is never over 40 F, then just about anything is reasonable.

Over 40 F, Almost anything that is not soggy can be wrapped in a bread dough and baked. The baking sterilizes the food on the inside and the complete dough will greatly increase the length of time that bacteria will take to get to pathogenic quantities. Call them empanadas or pasties, whatever. I call them lunch. Fresh fruit is better than a fruit salad.