Definitely take a shoulder bag. I've been to all of the Disney parks at least 2 or 3 times and it can get super hot and muggy, not to mention tiring. Keep your hands free and your body well hydrated. I recently made the mistake of taking my LV Speedy on a night out to a club and regretted it thoroughly. I can't imagine what I'd do with a bag like that for an entire day at a theme park. You may have to sacrifice fashion just this one time. Or maybe not....