We always bring their stroller. They are comfortable in it and I have it in the airport, hotel, and parks. I cut slits in a white towel, lay it in stroller, and pull stroller straps though slits. We take freezer packs and drop them in between the stroller and the towel to keep ds cool in summer heat at parks. Light clothing-I always buy white onesies and iron on disney clip art on them. I match shorts and voila a Disney themed outfit that keeps baby cool!
Also, we always rent items from ababiesbestfriend.com! They have so many items to help make baby feel at home while on vacation! We have garden grocer.com deliver baby food and other items to the hotel too. Enjoy!
I second the disposable bibs and table clings too. They make for a nice and easy cleanup and store nicely in the diaper bag. Enjoy!