Experience does not match description of "photographer's paradise"
You will drive straight down pot hole covered Denali highway alongside river, through vegetation, with forests and mountains in the far distance. Private properties on both sides make turning off major highway impossible.
Guides knowledgeable about vegetation, animals you won't see here, and entertaining with lighthearted banter.
Save several hundred dollars AND 4 hrs of disappointment. Instead, go to the Denali National Park visitor center and buy a national park pass for your family. You can hike easy, moderate, etc trails for minutes or hours, or ride the shuttle bus around to different vista views in the park, because the bus will stop when they see wildlife and allow you to take pictures.