I wanted to suggest to everyone that your local senior center has many ideas and activities that make a great day for a child to spend with parents/grandparents. I recently took my elderly parents to the local senior center and had a wonderful time. As a physician in the local hospital, I don't have much time for planning, and the senior center made for a great day. There were activities, events and showings. They had an attorney speaker Craig Janas. The senior center was sponsoring a talk. At the senior center Craig Janas spoke on retirement planning that made for an evening's worth of conversation with my parents as well.
The whole day was very memorable. I suggest to look into your local senior center!