You might like Time Among the Maya by Ronald Wright, 1989. It's about the author's journey through modern Maya areas.
For an archeological perspective, The Maya by Michael D. Coe, first published in 1966, is the classic introduction, but it primarily focuses on archeological sites.
The World of the Ancient Maya, by John S. Henderson, 1981,is also excellent, and it gives more of a historical and cultural perspective.
Books and publications by Lan Sluder:
Belize First Magazine (http://www.belizefirst.com
Fodor's Belize & Guatemala Guide
Belize First Guide to Mainland Belize
Adapter Kit: Belize (the first and only comprehensive guide to living, retiring, working and investing in Belize)
UpClose Central America