My girls love beads, but I am not going to recommend them in a moving RV. LOL
Foam, pipe cleaner and pompom creatures, plastic figures with playdough (recreate places they’ve just seen), rock and mineral collections (collecting and identifying), plant and leaf collections, writing a travel book or journal, indoor scavenger hunts, fun trivia games…have them learn to make non-cook related foods (fruit salad, etc)….