I will be in Spain then, but I can say I'm very jealous! Taormina was magic, and of the parts of Sicily I got to, my favorite. I only had three nights, so a week sounds great! There's a large grocery store near the post office, if you want to buy food outside of restaurants. Be prepared for lots of hiking up and down the town (the main drag is flat, but little else is). And even though the cruise ships disgorge lots of people at midday, they're concentrated at the Greco-Roman theater, which is large enough to absorb them.
If you're interested in going up Mt. Etna, be sure to pick a day with good visibility (the one day we had allotted for this was cloudy so we had to skip it).