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Basiliscus vittatus
Large lizard, approximately a foot and a half long, with a crested head. Spotted around noon, just before a thunderstorm.
Seen under large bushes in the open grounds of a local hotel/restaurant; the rural establishment was incorporated into a large patch of secondary growth rainforest and a slow-flowing tropical river, across the street from a thin strip of beach. This lizard seemed wild since it wasn't caged and could have easily wandered on the restaurant property, and was not human-friendly.
Sorry for the photo quality - I unknowingly startled the lizard and it was already running away when I first noticed it.
Thank you, PedroNicolau! I thought so too, and it took me completely by surprise since the lizards I'm used to are much less interesting-looking.