Please correct it: Afternoon plans ( Conversation between Matthi and Yvi )

Y: Right then, what are we going to do this afternoon?
M: Assuming the weather stays like this, we could go out for a walk with Buddy.
Y: I would really like to because I'm fed up with beeing indoors today.
M: We could go out into the countryside and on the way back we should fancy popping up to my parents.
Y: Do you really feel like this?
M: Yes, I do, actually.
Y: Right, okay.

very good!

Please correct it: Afternoon plans ( Conversation between Matthi and Yvi )

Y: All right then, what are we going to do this afternoon?
M: Assuming the weather stays like this, we could go out for a walk with Buddy.
Y: I would really like doing that, because I'm fed up with beeing indoors all day.
M: We could go out into the country and on the way back we could suprise my parents with a visit.
Y: Do you really feel like doing this?
M: Yes, I do actually.
Y: All right, fine.