On DS' first trip, he was 11 months old. Keeping his schedule as normal as possible was a big help. At the time he was still taking a short morning nap and a long afternoon nap so we would purposely try to be in a place where he could nap in his stroller for that first nap (we were sure to have a reclining stroller with mesh lining so the air could flow through). One of us (It was me, DH, my MIL, and Sister in Law) would take turns each day pushing him around in whatever park we were in until he fell asleep while the other adults went to an attraction. Then we would go back to the room for his afternoon nap. We learned early with him that he was happy if he ate and slept on a schedule that he was used to. Every kid is different of course, so whatever you usually do, I say try to stick with it within reason (it is vacation so naturally there are exceptions!).
Also:
-Taking a sound machine was helpful so that during naptime and bedtime we could block out any noise we needed to make before we went to bed.
-We used the baby stations for changings often rather than the public restrooms because it was cooler and one of us could change him while the other one went to the restroom and then switch. (This can be done in the public restrooms of course but it was just less hectic in the baby centers.)
-I tried to portion out all of his snacks before we left home so I wouldn't have to do it there each morning. I just bought lots of snack bags and packed an assortment of things that he liked (dried fruit, dried cereal, etc). I just like to have as little work to do on vacation!
-You've probably seen this on another thread already, but we did use a bright, unique ribbon for his stroller so it was easy to find among the many other strollers that looked like ours. When the CMs move them while you are in an attraction, it can be very hard to locate it if your model is a popular one.
Can you tell I am an over-planner???
Have a great trip!