I'm taking my 4 year old to Disney without a stroller (I think this will be OK as she is usually very active), but will certainly need to carry along some items for the long day in the park. What kinds of bags are best to carry around? I was thinking a small backpack. If you carry a pack, are you able to take it on rides with you? Looking for the best strategy for carrying some basics - snacks, water, sunglasses, etc. Any tips appreciated.