Dogs are not allowed on the race course as part of the race but dogs are allowed in the Town of Tusayan.

Yes: you can have somone pick up your shirt, race number, and any purchased souvenirs.  This is a small race so no need for a letter or other identification.

Yes. 

Yes, there will be multiple water stations on the course.

The Forest Service permit does not allow portojohns on Forest Service land.  There is a public restroom at about the 13 mile mark and the 26+ mile mark in the parking lot about 200 yards from the finish.  The IMAX also have plenty of restoom space.  It is a forest, so nature awaits.  Please clean up after yourself.

We do not have a gear check, but there is plenty of nearby parking so you can simply leave your items in your nearby hotel or vehicle.

There is plenty of restroom space in the IMAX Theater at the start/finish and the half-way point of the marathon.  The Forest Service does not allow portojohns on the course, so there are no portojohns in the forest and there are no portojohns on the course.  It is a national forest, so please bury or carry out what you pack in.