Combine all the ingredients for the shrimp marinade with the shrimp in a large ziploc bag. ...Refrigerate for 30 minutes to an hour.
While the shrimp is marinating, combine all the ingredients for the Cilantro Lime Crema and keep in the fridge until ready to use.
Combine diced tomatoes, white onion, garlic clove, jalapeno and salt in a blender. Pulse and pour into a large sauce pan. Add the cooked rice and simmer on medium low for 15 minutes.
Assemble tacos with shrimp, Mexican rice and a dollop of cilantro lime crema.
Notes
*The thing about this marinade is you can adjust the seasonings to the level of spice you want.