Hi from L.A.!
One of my faves, and it can be made with/without vodka, is a canteloupe slushy.
Fill a blender with 3 cups cubed ripe canteloupe and about 2 cups ice. Whiz it until it's like a rouch-textured slurpee. Add a squeeze of key lime and a splash of vodka if you like, and it's SO refreshing.
Enjoy!