In this situation it is absolutely forbidden to pass the school bus from either direction. In most states you can make a right turn at a steady red light after coming to a complete stop and yielding to the oncoming traffic. Click here for the most common American road signs. The United States recognises valid driver's licenses issued by most other countries but it is advisable to purchase an International Driving License. You can buy your IDL at your local Town Hall.
Rental cars are available in airports, hotels or individual rental companies.
Fly-Drive packages that include air travel, a rental car and accommodations at your destination are extremely popular. Most state and national parks, forest services and private campgrounds welcome RV's and provide electrical and water hook-ups. Some of the more popular campsites may require reservations, so check ahead.