Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Useful for planning

Not quite as thorough as the Lonely Planet Diving in Puerto Rico, but very helpful for deciding where to start. An added bonus is the short chapter describing inland hikes in Dominica, an island as stunning above water as below. I like the organization or these guides, with excellent icons placed conspicuously to help me skip what I don't need to know.