Suggestions for non-alcoholic drink using mint/simple syrup?

It's probably obvious why I'm asking this

We're going to have loads of mint infused simple syrup around the house tomorrow and I'm trying to think of things I could mix it with so my daughter can have a celebratory drink along with the adults. My first thought is just adding a splash of seltzer water, but I'm hoping people who are more creative/knowledgeable about cocktails than I am may have better suggestions (I could probably use a break or two from Bourbon myself at a few points tomorrow as well).

You could just substitute unsweetened black tea for the bourbon and let her have her own "julep".
Just don't get the glasses mixed up

You could also add it to a tropical juice - pineapple, mango, etc, perhaps with a little grenadine.

you can make a virgin mojito just omit the rum. This way you can celebrate both derby day and cinco de mayo!