Are you going to Utila to look for whale sharks? When I was there for six weeks in Feb-Mar 2004, they were the big draw. Dive boats would look for them in between dives and/or on the way back to town from dive sites on the north side of the island. And other boats would go out solely to look for whale sharks, especially from the nicer resorts like Laguna. If/when you get to snorkel with one (or several) whale sharks, it'll be hard to imagine a better photo opportunity. I saw one on a proper dive, too, though I was doing my safety stop and didn't get a chance to get a shot off. There were also rough-toothed dolphins, quite a few hawksbill turtles, spotted eagle rays, big schools of horse-eye jacks, barracudas, and other photogenic species. The juvenile drums were definitely popular macro subjects. Also look for sargassum frogfish in the floating sargassum.
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