I'll totally make a mess tomorrow cutting it up and putting it in the storage container. No way could I eat the whole thing in 1 day and the darn thing only stays fresh a few days.
I saw a recipe the other day on Better Homes & Gardens web site (bhg.com) for watermelon martinis. You could do it with the extra.

Puree chunks of watermelon in the blender til smooth, then pour puree into a pitcher and keep in refrigerator.
To make the martinis....in a blender put some puree, some ice cubes, some lemon vodka, lime juice, and Cointreau or Triple Sec, bit of sugar. Blend until ice is chopped up. Pour into a martini glass. I'd rim the glass in sugar instead of adding it to the mix.
Can't remember the quantities, but recipe is under the recipe section, and I think it was called "summer drinks" or something similar, there were about 20 or so recipes in the category.