Carrot cake, key lime pie, lemon pie (not my favorite, but my mom's), banana pudding, coconut cake or those fabulous key lime cupcakes from Bumblebee Bakery.
I haven't decided which one we are doing for Easter yet. One year we picked up a dozen cupcakes from Bumblebee and everyone was able to get their favorites.
I recently found Pillsbury key lime cake mix and key lime frosting at Walmart. It doesn't even compare to Bumblebee's, and not quite as good as my homemade (that my family said needed more key lime flavor) but it wasn't bad for a quick, summery/spring dessert.