This book is as engrossing a read as you will find anywhere on Christianity, theology, etc. Even if Christianity and theology isn't a topic that piques your curiosity, this book is a page turner.
I've linked up to a $3 copy of it on Amazon, and I highly recommend it. Randy Alcorn studied every page of the Bible for exactly what it says, and what is fair and unfair to expect about the Christian heaven.
He talks about issues such as:
Wouldn't Heaven be really boring?
Would there be sports? How would there be a loser?
Where is Heaven?
Will we feel pain in Heaven?
Will there be sex in Heaven?
What will food be like?
Will we be married?
What if a relative isn't there?
Will we have continuity between earthly knowledge and heavenly knowledge or will there be discontinuity?
What will we wear?
Is it actually a place? Like New York City is a place?
Isn't it just a state of mind?
There are far, far more interesting topics and questions than this in the book, but I don't want to spoil it for anyone who might want to read the book. One thing the author encourages the reader to do is lose the temporal earthly perspective, and have an eternal perspective. It is a very difficult thing to do until you have read this.
Note: Some of the answers in this book are very surprising...