France has a bunch of boonies too and it's a lot like how they show in Japanese manga (minus the rice paddies). Stores close at like 3pm, most folks just go for a walk or hang out at the church, even when there's no service, and TV is only watched for the news for a couple hours. If your a city kid, you WILL be bored to tears.
But you also only have your grandparents for a short amount of time. Treasure that.