You should have great weather then. Not as hot as it'll be a month later, but nice.
We can pick up some food for next couple of days…
Huh? You'll be on vacation. Hey, eat in restaurants. That's part of the experience. Even if you're thinking getting a picnic lunch, you'll have a couple of hours to kill. Most museums and other tourist attractions--except for the outdoors things--close for two hours at lunchtime. I think I mentioned this before, but don't expect to have dinner before eight. Later would be better; Romans aren't early diners. Some restaurants don't get going till around ten.
The thing is to eat two courses, unless you're at a pizzeria. At a restaurant, antipasti (appetizers), primi (pasta, soup, or risotto), and secondi (main courses) will be offered. Along with contorni (veggies) and salads, which you order separately. You don't have to have everything. A primo and secondo are fine, as are an antipasto and a secondo. Or even an antipasto and a primo. I've done that often, since pasta is my favorite. Avoid tourist traps. Someone will speak English at just about any restaurant. You might consider getting some kind of guide that translates food stuff.
You're probably right about the Vatican on a Sunday. But check the hours for what you want to see on Monday. Many museums' closing day is Monday. St Peter's will be open, of course, because it's a church, but the Vatican Museums may not be.
You'll be in a very central spot. So you can move out in any direction. It's a long walk from there to the Colosseum, though not impossible; I did it once. Rome is a good walking city. Um, except for the traffic.
You'll probably be more than ready for a beach by the time you get to Pantelleria, so that will be fun.
Tipping: Don't tip cabbies. At restaurants, service is included. But you're expected to leave a little extra if you liked the food and the service.
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