I guess caregiver was the wrong word. We do daycare for our niece. Our accountant said we can write off mileage for going to and from "entertainment" for the kids. We don't plan on doing long road trips because the kids are all under 5 and it's just not realistic. We can write off mileage for taking the kids to the park. The whole family will be caching with us so whether we poke around the bushes "looking for buried treasure" with my son (as he's dressed up in his pirate outfit) and niece, or we stare at them running around the park aimlessly, there shouldn't be any difference.
I hope this explains it a bit better.
Oh, and thanks for the 15 y/o crack t4e! Married at 15... I'm not Amish, I don't cache w/ a topo map and a Brunton... =)