I tore this recipe out of Martha Stewart's Everyday Food magazine the other day because I had way too much watermelon in the fridge. This turned out to be a nice refreshing drink, and easy to prepare.
5 cups cubed seedless watermelon
1 large English cucumber
1/4 cup lime juice
2 tablespoons honey
2/3 cup vodka
Set a large fine-mesh sieve over a large bowl or pitcher. In a food processor or blender, puree the watermelon. Pour the puree through a sieve, pressing on the solids iwth a rubber spatula. You will end up with roughly 2 cups of juice. Puree the English cucumber, peeled and cut into chunks, and pour through the sieve into the watermelon juice.
In a small bowl, stir together lime juice and honey. Mix together. Add to the watermelon and cucumber juice. Add the vodka and adjust the sweetness with more honey, if desired. To serve, fill four glasses with ice and top each with a slice of cucumber!