Vaccinations recommended for travel to Aruba

Do you have to have some kind of proof that you have gotten the necessary vaccinations? If so, where do you have to present it?

I just found out that they recommend, not require, travelers to get the Hepatitis A, MMR and Tetanus-Diptheria vaccinations. My children are so relieved that they don't have to have any shots. That was taking all of the fun out of the vacation for them.