I'd avoid big cities like Milan or Turin 'cause I heard that in summer they empy, are hot and become quite boring. Most of the college students that move to the north to study, go back home to the south in summer. This happens where I live too: students go home and the locals move to the coast during the weekend.
If by scenary you mean beaches, I suggest you Tuscany and Liguria. Viareggio, in Tuscany is where you can have lots of fun 'cause it's full of discotheques, pubs, bars, restaurants. And it's on the water. It's excellent for shopping too. Just in case. Livorno and surroundings may be a good option too. Altough it's quite stabby during the day, it becomes extremely lively at night. It's on the water too and it's very very clean, and beautiful. there are rocks all over the coast. I love it. Of course you'll need a car to move around. It's still in Tuscany which is well known all over the world for its scenary. So if you get bored and don't want to go to the beach, you can visit San Gimignano, Volterra, Pisa, Lucca, Florence and many others. If you are more into lakes and mountains, I suggets you Garda lake ( north of Italy ) and surrounding such as Verona or Mantova ( my favorite ). I heard that the southern part of the lake is the most lively one. Desenzano, Limone, to name a few.
Have fun here
