Decorate in a Pinch

In fact, you really only need one party decoration (hint: it's a pinata). It’s colorful! It’s interactive! It’s wise to hand out the broom before everyone has had three margaritas! Buy a big piñata that fits the mood of the fiesta (try orientaltrading.com or confettisystem.bigcartel.com). “Fill it with dollar-store items in one color. Monochromatic always looks chic,” says Calder Clark. “Buy things people can wear, like sunglasses and necklaces. It will make fun photographs.” Other festive loot: lottery tickets and—especially for a pool party—mini water pistols.