Hi marks,
Sorry for the delay in coming back to you about this one, I asked a colleague for this information and they replied when I was out of the office.
We don't currently offer an excursion to the Aeolian Islands on this trip however you may be able to arrange a trip once you are at the resort. Depending on where you would like to visit, ferry crossings from Cefalu to Lipari take about 1hr 45 minutes (different islands would take longer). My colleague had a very quick look on the internet and has said that the price of excursions to and from Lipari start from around €60.
I hope this information helps,
Kindest regards,
Julia