It is not unusual to see and hear a young child have a crying melt down while the parents are standing there looking embarrassed. One reason for this crying is that little children often have no other way of expressing themselves.
Another and probably more significant reason is that being on a trip or vacation they find themselves in unfamiliar surroundings. Where you as an adult may look at your new environment with interest to the young child it might be frightening.
Imagine that you are at Disney World and had never before seen any of the Disney characters. Suddenly, a five foot mouse, with big ears, a squeaky voice, walking upright, approaches you and says, “Hello, my name is Mickey.” No one would blame you for being a little upset. Think how a little kid feels in unfamiliar surroundings. Young children need and thrive in stable environments. They are uncomfortable in airports, planes, trains and busses as well as restaurants, movie theaters, stores and dozens of other places.
The best thing you can do to avoid the crying is to tell the child where they will be going tomorrow. Tell them what they are going to see and what fun things they should look for. As you arrive at the places you told them about remind them of your discussion. Another words, based on your conversation as to what they will be seeing you are making them seem more familiar.