When oysters are fresh, you really don't need much to enjoy them. My favorite preparation is to mix up a ginger-lime mignonette with just a touch of heat.
Stir together the lime juice, vinegar, sugar, ginger, and pepper in a small bowl. Let sit for at least 10 minutes to let the flavors combine. Spoon over the oysters and serve on crushed iced.
Notes
A few hours before: Prepare the mignonette sauce and refrigerate in an airtight container
Just before serving: Shuck the oysters, spoon the mignonette on top, and serve on a bed of crushed ice.