Today's Groupon deal is $10 for One Admission to Green Meadows Petting Farm (regularly $21). This is a great place if you have kids. They have TONS of animals, and a lot of the areas allow you to actually, pet, pick up, and interact with the animals. I've been there before and it's well worth the money.
Also, check out their Side Deals: $25 for $50 of Custom Products from The Personalized Doormats Company, $30 for $80 of Styles and Designs at Something Rebellious , or $25 for $50 Worth of Online Merchandise at Marbles: The Brain Store.
As always, check out the cash back sites before going to Groupon. You might just score some cash back on your purchase!