We are going to the park July 20-30 and would like to do some white water rafting. We have rafted before In Jackson Hole and West Virginia. We are a family of 4 with 2 adults 2 teenage boys. I am looking for which outfit to use, on a half day kind of tour, and what location is most Exciting in July. We have a car and can go wherever! Thanks in advance for the advise.