You could give it away. Or shred and freeze it. Or puree it and then freeze. (I prefer pureeing & freezing because it maintains the same texture when thawed. It hides better in zucchini bread and soup, too.)
dehydrate it and turn it to powder.
It takes very little space to store it this way, and it's easy to use. Mix 2-3 Tbsp. of powder with enough hot water to equal one cup- for one cup (8 oz.) of puree.
Try it in Lemon-Zucchini Bread or Curried Zucchini Bisque (creamy soup). Mmm.
See this post for how to best store the powder.