Tracy C. (clixby) reviewed Diving and Snorkeling Guide to Texas: Includes Inland, Coastal, and Offshore Sites (Lonely Planet Diving & Snorkeling Great Barrier Reef) on
Especially those unfamiliar with all the dive and snorkel sites in Texas. It covers Inland, Coastal and Offshore diving, and each site offers ratings on skill level, visibility, depth, temp and more. It has photos and a description of each site. Mostly geared toward diving. The snorkeling is mentioned for those who bubblewatch, I'm guessing.
