I found out that you can go to national parks for FREE during certain parts of the year. We're so going to go at least once this year.
January 15-17 (for Martin Luther King Jr. birthday
April 16-24 (National Park week)
June 21 (First day of summer)
September 24 (Public Lands Day)
November 11-13 (Veterans Day weekend)
Check out the website for other free national park things at: