Good job on not responding to his bait. How about blocking all of his emails? Or, you could have them directly forwarded to a folder where you don't feel like you have to read them. Or, just hit "delete" if you see his email.
It's great you are having a wonderful vacation with your daughter. The beach is a wonderful place to get perspective, relax, and build memories. You don't have to do anything right now or think about what is happening back home. Just watch those waves go in and out and listen to the surf. Feel the sand on your toes. That's a wonderful place to back to in your mind when you need to relax back at home.