How late in the day do you feel comfortable going to the park or similar without applying sunscreen to your LO? What if you applied it earlier (like, you put it on before going out at noon, would you reapply at 3? At 4?)

I can never decide when I'm being crazy overprotective and when I'm being negligent. And C has her daddy's fair skin, while I have a family history of skin cancer, so I do want to be extra careful!