In Italy....?

I am going to Italy tomorrow, with my mum and dad. I am 16, and we are using big travel rucksacks instead of suitcases due to travelling about. First we are flying from England to Pisa, where we are going to go to the leaning tower, and staying at our hotel, next day we will be getting on the train and going to Rome, where we will go to the vatican city, coloseum, and go on some bus tours, we will be in Rome for 3days, after Rome we will be going on train to Pompei where we are going to go to see the ruins, we will be there for one day (i think) the next morning we will be travelling on train to Vada, the last stop we are going to make to relax on the beaches, and in the pools and stuff, for 3days.
Is there any food in particular I cant go to Italy WITHOUT trying? because of corse we will be going to restaurants every night.
Whats the weather like at the moment in Italy and when the forecast says it will be hot.. WILL IT? i NEED a tan thankyou!! Continuing on the edited bit...
Additional Details
It said on the forecast when I looked at it, about 'T-storms' what are these and will they last for long, destroying the weather etc? :( as when we went to Greece they had little bits of thunder at night where it was so hot during the day, but by the next day it was sunny again. Are we likey to see any rain whilst we are there?
Are the people in Italy Friendly?
Last thing - is there some basic speech we are going to NEED to know to be able to survive out there or will we be ok with the odd (According to free translation website...) 'ciao' (hello) 'arrivederci' (goodbye) as well as pleases and thankyous?

thanks in advance if you can help.
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