Watermelon and avocado: two of my favorite things. Put them together, add some cheese (my other favorite thing) and what you get is one ridiculous summer salad.
I chopped up about a half of a watermelon, two avocados, and mixed with about 5 cups mixed greens (and some spinach that I illegally mixed into my 'bulk lettuce' bag). Central Market would understand, I am a very loyal customer. Then I topped with Feta cheese, and a pineapple-balsamic vinaigrette. I sort of eye-balled the dressing, but I would imagine I used the following approximate quantities:
3/4 cup Pineapple juice
2 T. balsamic vinegar
1 t. olive oil
Toss the salad and dressing and you're done. Delicious!