I pack a set of snake gaiters to wear (including with shorts) when walking around in snake area.
At the campsite, with a long stick/old ski pole etc... I walk a perimeter around the campsite looking for piles of rocks or other snake hiding places and poke around; I've found snakes hiding in the fire pit rocks so watch for that.
If anyone gets bit:
Do Stay still and calm, Sit or lie down so that the bite is below the heart
Do Remove any jewelry, watches, shoes or tight clothing before swelling starts.
Do Clean the bite with soap and water. Cover or wrap it loosely with a clean, dry bandage.
Don't use a tourniquet or apply ice.
Don't cut the bite or try to remove the venom.
Don't drink caffeine or alcohol.
Don't give or take pain-relieving medicine, such as aspirin, ibuprofen (Advil, Motrin IB, others) or naproxen sodium (Aleve), they can increase your risk of bleeding.
Don't try to catch or trap the snake, take a picture if possible or get a good look at it to describe it to medical personnel.
Most of all, teach them to have fun but be aware, watch where they walk - walking sticks are great for poking ahead to warn the critters you're coming.