In a high-speed blender, combine watermelon, lime juice and honey, to taste. (If your watermelon is particularly sweet, you might not need any honey at all). Whirl until completely liquefied. Refrigerate until very cold. (If you're feeling fancy, you can strain the juice if it separates at all -- I tend to be...not fancy.)
Divide juice among 4 glasses. Top until ⅔ full with cold sparkling water; finish with 1-2 scoops ice cream. Enjoy!
Recipe by the pig & quill at https://thepigandquill.com/honey-lime-watermelon-floats/