It's time to start planning out your Spring and Summer vacation, and if you're planning to see some national parks in the United States, I've got a special guest who has a wealth of knowledge on the subject. His name is John Tillison and he spent 20 years as a park ranger, helping maintain our parks, informing visitors through interpretive programs, and through law enforcement. John started a blog a couple years ago helping people get concise and targeted information about our 418 nationally managed park destinations and 61 official national parks.