Lots of things occupied my children during their (our) stay at Grandma and Grandpa's. For my boy child, it was 99.999% of the time equipment. The kind you ride on, and the kind you drive with chubby fingers. The kind you ride on always ALWAYS won out, but on the off chance that he couldn't hitchhike a ride on a four-wheeler, kayak, tractor, truck, lawn mower or doodlebug...he settled for the toy trucks that occupied his Papa in days gone by.
And always while driving: the vrooms and vibrations of real motors bounced off his lips. I never knew that car sounds were innate in the male gendered species, but these sounds have echoed off his lips since the time he was a bitty.