This book contains a surprising amount of various information on Thailand. I don't know if there are better and newer books available today, but I found this one very good when I visited Thailand about 10 years ago.
The chapters include: Bangkok Basics, Bangkok Sights, Accommodations, Food, Entertainment and Shopping, East Coast and Vicinity of Bangkok. There are pages with maps, including Central Bangkok, Chinatown, Banglampoo, Silom, Sukhumvit, Pattaya, North Pattaya, South Pattaya.
The reason why I chose to buy this particular book was because it was the only one I could find that recognised the legitimacy of sex tourism. No, Mr. Parkes doesn't actually say anything so controversial in the book, but he gives clear advice like: this area is more suitable for couples, and that area is more suitable for single men. That's, I think, the best you can expect from a generic travel guide.
In particular, the book proved invaluable in Pattaya, of which I knew very little before. The book contained clear and concise maps of Pattaya's relevant areas, so I easily found the main area of what's euphemistically called "nightlife". Once I was there, finding a suitable hotel and places of action on my own was easy. I ended up spending awesome time.
My only complaint is that Mr. Parkes uses road names like Soi Yamato and Soi Post Office which may be commonly used among the experienced tourists and expats, but are not the ones you'll see on street signs. (It's Pattaya Soi 13/1 ja Pattaya Soi 13/2, respectively.) What was called "Central Pattaya Road" in the book turned out to be "Pattaya Klang Road" or something in the real world. That made finding my way in Pattaya somewhat more difficult than it had to be.
I should also mention that on the book's last page, there is a humour corner for non-English speakers. Among other things, it contains the image of a clock dial with 13 written next to 1, 14 written next to 2, and so on - the kind I remember we had in the kindergarten. :-))