Spin the Bottle with shots! Directions: Fill plastic cups with a variety of beverages (could be non-alcoholic). Get creative with it! Write on bottom of cup what the beverage was. Now open a beer, pass it around and let everyone have a pull til it's empty. Then start your game!
Pre-mixed cocktails in mason jars on ice. This has nice DIY feel to it that everybody will love. Mix up some margaritas, cosmopolitans, Bahama Mamas -- whatever you'd like -- and label the tops of the jars for your guests. Make sure you include some regular Colas for the kids!