Below are two videos. The first is a video that will teach you how to play this song on guitar. It was made by the folks over at Next Level Guitar. These guys produce a lot of great instructional videos for guitar. Definitely check them out when you have time. The second video is the original song as performed by the band America.
Video Lesson From You Tube
As David from Next Level Guitar demonstrates below, this song only has two chords, which makes this song very easy to play. It was one of the first songs I learned on acoustic guitar. The two chords you will need to know for this song are: E Minor and a D6 Add 9 Chord which David will explain how to play. I know, it sounds like a complicated chord, but it really is very easy to play. Enjoy!