Question: I'm looking for a book that isn't too dense and that is usually recommended for someone who wants to learn of the mind/consciousness but doesn't know where to start.

Answer: 
To be honest, it is hard to recommend a single book. If you really want to understand philosophy, you must read many books. So you might want to start with Hume's **Enquiry Concerning Human Understanding**, Berkeley's **Treatise Concerning the Principles of Human Knowledge**, Descartes' **Meditations** and **Discourse on the Method**, as well as Kant's **Critique of Pure Reason** and **Principles of the Metaphysics of Morals**. These are by far the best epistemology/metaphysics books I have ever read. It might seem obvious recommending such well-known books, but they are well-known because they are truly phenomenal. Also, if you are interested in the development of mathematics, and in particular analysis, I would recommend **The Analyst** by Berkeley -- a remarkable book. If however, you do not have time to read them all, start with Hume's **Enquiry Concerning Human Understanding** and Berkeley's **Treatise Concerning the Principles of Human Knowledge**, and avoid Kant' **Principles of the Metaphysics of Morals**, and any of Kant's books because they are very difficult to read. You need to read each book at least twice to understand Kant.
The most accessible book I have read on consciousness was The Mind's I, by Dennett and Hofstadter. It was a series of science fiction short stories that illustrated various thought problems in consciousness, followed by the two authors discussing the implications of the story. For someone just getting their feet wet in philosophy, it is a great easy introduction. 

The best single book on philosphy of mind I have read is Blackmore's A Very Short Introduction to Consciousness. It is VERY SHORT, with very clean writing. It is also focussed on compiling the evidence that has a bearing on the viability of consciousness theories. Blackmore takes one through this evidence, and with a general dialog between dualism, materialism, and her preferred delusionism viewpoint. Blackmore would probably be best read after one has at least skimmed a general overview book on philosophy of mind, although one could read her first, then the overview second.