First time road trip for 2 Florida families. We are in the planning stages of a 2 week June road trip. We are planning to fly in to Las Vegas and rent RVs to travel in. We would like to see the Grand Canyon and Yellowstone before heading back to Las Vegas to fly home. We will be traveling with 7 kids total. What do you suggest we add to our itinerary? We are all pretty new to this road trip idea. So, any help is greatly appreciated. Thank you.