A successful July picnic with children needs more than a large lawn. The best plans join a short shaded walk, a reliable lunch spot, nearby toilets and an easy escape route if the heat, mud or tired legs change the day. How should you plan a July picnic around heat and shade? Start with the hottest part of the day, then work backward. Children usually cope better when the walk happens before lunch, the main meal takes place under mature trees, and the final activity is close to toilets or transport. Build the day backward from lunch 8:30 to 10:30:…