I love printables (as long as I have ink and paper). They provide an easy, cheap activity that I don't have to leave the house or think too much about. I like ones I can print out and keep on hand for long restaurant visits (when I remember to bring them) or car rides. Something new to do/play with without having to go search the store for something different.
I've shared some of my favorites before so I thought I'd share some more - there are some for older or younger kids here.
I love this vintage I Spy printable from Just Something I Made
Or mazes for every level from Krazy Dad (there are thousands and other printable games as well)
I love anything Joel makes and he just posted these printable Paper City Halloween characters
My boys are into Mad Libs these days and I found a few Fall (and other holidays) on Classroom Jr.