This book was a truly profound read for me. It really forced me to rethink some very old, very deep assumptions about my hope for a future life and how my imagination shaped that faith.
For those of you not familiar with Pieper, this is a short book, filled with gems of deep wisdom that come from a lifetime of study and thought. His writing is very accessible, yet challenging. However, while the title might be mistaken for a tract by Deepak Chopra, make no mistake, this book fits firmly within the tradition of Western Christian thought. Not as experienced by many contemporary Christians, to be sure; Pieper is a scholastic, and his writing is deeply Thomistic.
In "Happiness and Contemplation", Pieper is exploring the actions proper to humanity; the teleology, or most fitting activities which fulfill our deepest sense of purpose. That activity he identifies as contemplation; but a very act of contemplation. Heaven will not involve sitting around and staring at things; this contemplation is a deep engagement with God, and through that engagement, a deeper connection with creation, as well.
I'm afraid I'm a poor apologist for such a brilliant author, but I can't recommend this book highly enough. An excellent primer for scholastic Western thought on human nature. However, if you're looking for something even more accessible, then try his other short masterpiece, "Only the Lover Sings." It's a series of (very) short essays on art, and it is as beautiful as the title.