From the rides to the shows, theme park vacations are a sure bet for family fun, but they can also lead to some stressful situations. Packing expert Anne McAlpin (whose packing tips are found on PackItUp.com) says there are plenty of ways to prevent or alleviate vacation setbacks if you plan ahead and do some thoughtful packing. Here's what you can bring to the parks to make your family trip effortless -- and memorable.