We use Blue Lizard or Aveeno for DD cause she has eczema. Works very well. We don't use the spray because (for whatever reason) it freaks DD out (this kid would ride Space Mountain over and over but is scared of sunscreen!). More important than the SPF is the "re-applying" thing. I had malignant melanoma that spread to my lymph nodes (I'm okay now, cancer-free for almost 6 years!) SOOO, here is my advice. Put on sunscreen in your hotel room BEFORE (you or) your child gets dressed. Then, when you arrive at the parks, apply a second coat in the exposed areas. Apply more if you go back to the room to go swimming. Also, if your children will actually keep them on their heads- put on hats. If they don't make sure that you put sunscreen on exposed parts of their head (for instance, if you have a little girl and her hair is parted and braided...make sure to put sunscreen on the part!) Okay, those are my tips.