When you're in a busy parking lot use a "safety spot" on the side of your car while you unload the stroller, etc. Your child should place their hand on the safety spot and not move until you tell them it's safe and they can hold your hand.
Sensory mats - "Goo bags - recipe for goo. I've had it suggested to use an entire bottle of dollar store hair gel, but this is probably just as inexpensive, and you can make whatever VIBRANT colours you want." Letter writing with fingers or Q-tips.