Mom and the summer sun

I have three active kids that want to be out and about during their summer break.  Before this year I would be outside with them all summer at the pool and the zoo no worries.  This past week I was out and about with them like normal.  I remembered to put on sunscreen (I have never needed it before) but today I have a small bumpy rash all over my arms, back and legs.  Basically where the sun hit my body.  I think that I will get a big floppy hat to help cover my face and back but what am I supposed to do when we are at the pool?  Do you think I need a better sunscreen?  What kind do you all use?  We can't just stay in the house all the time.  The kids will drive each other and myself crazy:)

Thanks!