What are some nice foods to bring for a picnic?

I plan on bringing my girlfriend to Seaport for a picnic but I don't know what kind of food to bring! She can't have anything with dairy in it because she's lactose intolerant, so baked goods and chips are out of the question. I want to bring food that don't really need much preparation when we have it, like sandwiches or salads. What other foods can I bring that are ideal for picnics and that don't really require some sort of refrigeration along the way (nothing with dairy in it please).