Whiskey sour punch or slush (though I don't know if the slush would work without the alcohol - probably not). My family has one of the two at every holiday/celebration, and we love it so much we even made a bunch of batches of it to be served at my wedding.
My family's recipe for the punch version is:
3 x 6oz cans of frozen lemonade
3 cups orange juice
A fifth of whiskey (cheap works fine!)
1 liter of club soda or plain seltzer
For the non-alcoholic version, you could replace the whiskey with 7-up or Sprite or a similar citrus soda, or with plain or flavored seltzer/club soda
We serve the punch with a bowl of maraschino cherries and orange slices on the side to garnish your drink with (for some reason, we always call the fruit "garbage" - as in, "do you want your with garbage, or without?" Weird, and I have no idea where that comes from!)
Anyway, the alcoholic version is always universally enjoyed. I've never made it without the alcohol, so you may want to buy a bit of lemonade, OJ and seltzer/soda and experiment a bit if you decide to try this out.
If you don't make it for this occasion, try it sometime when you're not pregnant! A whiskey sour from a mix will forever be extremely disappointing after.
