This is a super easy way to prepare shrimp. This marinade also works well for scallops, but they don't grill as easily.
Marinade
1 tsp grated lemon zest
2-4 cloves of garlic, finely minced or grated
½ cup extra virgin olive oil
¼ cup canola or vegetable oil
½ tsp salt
½ pepper
½ dried oregano
½ red pepper flakes
1 tsp fresh lemon juice
Combine ingredients in a bowl and whisk to combine.