Change July to first week in September. Fall colors will be in full bloom and animals will look their best. I was a wildlife photographer living in Alaska for several decades and nothing beats first week of September.
Chances of seeing northern lights in July is almost impossible due to excessive daylight.
You can only drive a short distance in the park, roughly 12 miles. After that you either walk, bike, or take the park service bus.
If you’re stuck on July, try to get a permit for McNeil River. It is most likely the premier place in the world for photographing brown bears. Truly awe inspiring adventure. I was lucky enough to draw a permit 4 times and nothing compares to it.
