Following the swim in the Sand Hollow Reservoir the Ironman St George T1 transition zone is in a very large and quite nice parking lot. In addition to the standard port-a-potties a number of full structure bathrooms are around the parking lot which usually serves as part of the Sand Hollow State Park. The view from just up from the water for the athletes will look something like this, plus a couple of thousand bikes in bike racks.
As you view this video you will move to the right area to get to your bike and then shift left out to the bike course which opens on a downhill grade and gets you some good initial speed.
Official Ironman St George Transition T1 map located here