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Hibiscus rosa-sinensis
Beautiful, bright red flower with fringed petals on a small tree with narrow trunk, approximately 2m high.
Growing naturally in sand near a beach in a hot, humid climate.
After some googling I see they can in fact look exactly like this one. Sorry, I should not rely so much on wikipedia!
I don't think it's a Chinese hibiscus - it was growing on a tree, not a shrub, and the petals of a Chinese are not fringed along the edges.