You can use Euro all over Italy.
Swiss and Europeans citizens don't need any visa, they just need to present a valid I.D.If you go by car, you have to take your international driving licence and your insurance card.
There's no special risk in Italy except the sun for those with sensitive skin. In Italy, the sun can easily damage your skin , so you need to protect it with high protection solar cream before each cruise.
Emergency : 112
In Italy, power is on 220 V,and plugs are the same as in Europe.
Italy have a temperate climate.But ther is bug differences of temperature between coast and mountains. Durind summer, it is warm and dry but temperatures are lower on the Adriatic coast than on Méditerranean coast.
Conditions for renting a boat
If you want to rent a sailboat or a motorboat, you need a sailing licence or a boat licence.