I will be traveling from Seattle, WA to Crater Lake national Park, OR, Yosemite National Park, then to Zion, Bryce Canyon before heading to Arches and Grand Caynon in late June (3 weeks) and concluding before 04Jul14. I will be traveling with a family of five (3 kids all under 13) and a travel trailer. I am looking for the best campgrounds (national parks/State Parks) in the area of these national land marks. Thanks for the advise!!