How about I spend a few days at my grandparents house?
Why did you go to your grandparents house for a few days
Because the solitude made me feel very relaxed. Although I do feel a little bad about it.
It's good to take some time for yourself and relax. Since your grandparents are accommodating you it would be nice if you did something for them as a way to show your appreciation.
Maybe.
You should think it over a bit more. Think about how grateful you'd be if someone showed their appreciation to you.