We stayed in loop C, all the loops other than E are tight and very close together.  It rained each day and there was a puddle in our site most of the time.  The place was clean and bathrooms very clean.  If you can get a site in loop E they are concrete pads including under picnic tables.  There were no picnic tables on loop C.

Very convenient for seeing the Park, quite at night. Loop C did have trees, where loop E does not have many trees.