Check this page on the Life is Good site:
category – camp and hike
My own personal favourite: Not all who wander are lost. (I have 3 of these.)
Life is good Inc. is doing well:
Last year, the company sold 4.2 million of its $25 T-shirts and had sales of roughly $107 million, said Bert Jacobs, who along with his brother, John Jacobs, founded the business in Needham, Mass., in 1994 with only a handful of styles and a van.
They were trying to create “a symbol about what was right in the world,†he said
(via Wicked Outdoorsy)
besthike.com 
Hmm… The “Not All Who Wander…” shirt is my personal favorite as well. What a surprise! 🙂
Okay, now I feel stupid. I always thought Life is Good was a trademark by Jeep. Little did I know that it was its own company located about 20 minutes from my work.