Do you have any advice for potential travellers?
The walks are fairly short and the ascents/descents are not too difficult.
Travelling to Lipari takes a lot of the first day, it would perhaps be an idea to extend the holiday for a day or two on Sicily if you have the time.
If you normally walk with poles then take them, if not then you'll manage fine.
Hot mud bath on Vulcano - it's perhaps an idea to just dump the swimming togs afterwards, the sulphurous smell still hasn't washed out of mine! Also perhaps wear old trainers/water shoes if you plan to swim to the fumeroles on Vulcano, the sea bed is slippery and stony thanks to the nutrients in the sea.
We didn't quite reach the peak of Etna due to the snow, but the cable car and snow cat ascent were interesting with a small ascent afterwards. Take a scarf for your face if taking the snow cat, the diesel fumes are quite strong.
Arancini, Pizza, Pastas, Pistachio Gelato and Ricotta Cannoli...