We just went to Yellowstone last week. Thankfully no lightning. Of all the ways to get hurt in Yellowstone, lighting has to be at the bottom of the list.
I never really thought I was afraid of heights, but I seriously thought I was going to be sick after driving around those mountains with a 1 inch expanse between the white line and an 8000 foot drop....
Fortunately I will not be driving.
Once in the Park we plan on taking some bus tours. I hear it is worth the trip and so we are looking forward to it.
I *am* afraid of heights, but I didn't have any issues driving around when I was at Yellowstone last month.