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Wonderful pictures Mick, lovely to see somewhere so exotic. I think you giant leaved plant was probably an Alocasia, one of several plants that share the common name of elephant ears, & the red flowering shrub is most likely Malvaviscus arboreus, related to Hibiscus.
I concur with the Alocasia ID, however I don't believe the red-flowered plant to be Malvaviscus, it surely looks like a true Hibiscus species to me (it is a huge and wonderfully varied genus). Malvaviscus has softer light green mildly rugose leaves, and upfacing flowers that never open more than shown in my photos, although the stigma does exsert itself beyond the twisting petals.
Happy to bow to your superior judgement Mark, I've never grown the plant. Although interestingly in the Martin & Rix book Conservatory and Indoor Plants Vol 1, they show a pic of M. arboreus in Hong Kong with distinctly nodding flowers and M. arboreus var. mexicanus at the Huntington garden, California which looks very like yours with mostly upright flowers (but protruding stamens); though the text for the latter says nodding flowers.....
We stopped off for a cycle trip around Cat Ba island where we saw this stunning leaf, no idea of what plant. There was also this white flower quite common.