mark out a large board game and play the game
Masking tape or chalk, game cards (see attachment), dice (giant dice can be made from a cardboard box), obstacles
Use masking tape or, if outdoors, pavement chalk to mark out a giant game board (10x10), add obstacles such as gaps to jump over, piles of sweaters (eg) to climb over, tunnels to crawl through. Use the attached game cards (or add your own) to add an extra dimension.
The cubs will be playing against their parents - firstteam to get all its players home will win.