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Have you checked out these sites? Etna wineries tour. Private shore excursion/ day trip Cefalu Tours, Cefalu Private Tours Cefalu Tours Cefalu Shore Excursions It's pretty apparent you would need to arrange a private excursion from Messina. I don't know if this is of interest, within budget and, most importantly, within a safe time span while you're in port. I'm not personally familiar with either of these sites. Any of my friends who have done the type of excursion that you want have done a ship's excursion, and mostly from Catania. Catania is much closer to Etna than Messina. Also, as I mentioned in my earlier reply, Mt. Etna has been erupting frequently of late, so ANY shore excursions in the area are subject to cancellation or modification.
Have you checked out these sites?
Etna wineries tour. Private shore excursion/ day trip
Cefalu Tours, Cefalu Private Tours Cefalu Tours Cefalu Shore Excursions
It's pretty apparent you would need to arrange a private excursion from Messina. I don't know if this is of interest, within budget and, most importantly, within a safe time span while you're in port. I'm not personally familiar with either of these sites. Any of my friends who have done the type of excursion that you want have done a ship's excursion, and mostly from Catania. Catania is much closer to Etna than Messina.
Also, as I mentioned in my earlier reply, Mt. Etna has been erupting frequently of late, so ANY shore excursions in the area are subject to cancellation or modification.