Warmer months mean picnics at the park. Even if the venue has trash cans for food packaging, consider bringing as few food items as possible because overflowing receptacles can be a buffet for wildlife; a gust of wind can redistribute your trash all over the park. Wrap sandwiches in aluminum foil and opt for a beverage in a reusable thermos that has a built-in cup. Pack fruit that wraps itself -- like bananas or apples -- and bring the peels and skins home. Bring everything and take everything home with you.