My three year old kid was absolutely delighted with the aquarium - in fact, she loved it better than anything else on Elba.
Advertised as the largest Italian aquarium after Genoa, in fact this is a rather unpretentious facility located in the basement of the Marina-2 hotel. A grown-up will probably see all there is to see in 20 minutes; but for a small kid its a whole new world of Mediterranean sea life. The exist shop makes the visit even more memorable...
Be prepared that all labels are only in Italian and German (ok, the names are also in Latin, but that did not help me too much). Another thing to be aware of - the hotel's bar and restaurant at the top of the aquarium has a stunning view of the Marina di Campo harbor - but for some bizarre reason does not serve meals to non-residents.
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