imo unless your child is use to getting up early, staying up past regular bedtime, being over stimulated, and walking 4-5 miles a day in, for instance while we were there this week, was feel like temperatures up to 109 degrees midday with 75% humidity then get a stroller or you'll get a child whose harder to handle than needed. you'll get tired yourself who needs extra cries of pick me up, grumbling with siblings etc... i say get a stroller, you'll keep your sanity and have a smoother vacation. if they want to walk and you're pushing an empty stroller part of the day you can always park it and grab it when you need it, you'll have a place to leave your extra stuff and when they start getting tired you've already got it.