A picnic can be as simple or sophisticated as any other meal. Before you plan the menu and make your lists, think about who's coming, and what vibe you're going for: A spread for a crowd that needs to last through a hot afternoon without wilting (or worse)? An elegant birthday dinner repast in an orchard? No matter what kind of picnic you're creating, unless you are in your backyard you'll need to be as prepared as a Boy Scout, with a full-on checklist. Napkins and wine openers don’t grow on trees, after all.