We've done the first day and agreed, it is a great thing to do early in your trip because the hairstyle holds at least an extra day or two (we may or may not have pushed it longer than that). It looks super cute in the photos, and the characters all complimented my DD on her hairstyle. If your DD wants to swim, though, you might want to consider doing it your last day or towards the end of your trip. We are taking my DD again this summer and actually ended up calling and moving it to the latest time they could book for our last day there for this reason. The hairspray they use holds really well, but I'm not sure it would do great in a swimming pool!