If you want to drive the parents nuts for a week or so, drums and whistles are both tried and true items........
Speaking from personal experience....
Rog
Hey Rog, I can also, from personal experience, vouch for the instrument I've played all my adult life....TUBA!
I have been a pro Musician for the past 30 years, though now being Disabled I don't do any touring. It's a hard life as a touring Musician.
Keith (Norfolk, England)