19. Host A Grandparent Camp
This is an especially great activity for a child with siblings because you can make it dedicated time just for them. Have them pack their bags for a week at your house. You can fill your days with projects (like bracelet or birdhouse making) and field trips (fire stations are a good option). Kids of all ages enjoy making forts out of sheets and cushions in the living room, and you can really complete the theme with s'mores (in an outdoor fire pit or even the microwave).