This is a fully realizable plan: I would recommend the first week of the beach, the second - to take the car in a network company with the ability to pass in another city, and the third - again the beach with the transfer order to the airport for two adults and two children. Useful information about traveling through Italy by car can be found on the portal pages. I advise you to pay attention to the Adriatic and the Tyrrhenian Sea.

Now about the resorts of Italy ...

The Adriatic can look like this:

Air travel to Rimini (inexpensive option with a large number of charters) Venice, and a return, for example, Rome. Other options are possible:

Then (in the first approximation) the following program is possible:

First week: a resort in the vicinity of Venice: Lido di Jesolo, Bibione or Lignano Sabbiadoro, but in no case not Grado - there is a muddy bottom. You can go on the following excursions: Venice, Verona, Gardaland. But there is one BUT: all these resorts are crowded. If you need a more relaxing holiday and small resorts, you need to go south of Venice.

The second week: three or four days on the road, stops - Pesaro, Cesenatico or Riccione. In addition, I advise you to visit "Mirabilandia". Another plus - these resorts are excellent shopping. In Riccione there is a street of Ceccarini boutiques, well, and various wholesale warehouses. There are a lot of agents, they will be gladly taken to shopping, they have about 10% of the warehouses. From the excursions: the historical center of Pesaro, San Marino (40 minutes from Rimini), the fortress of Gradara, the city of Urbino ...

Very interesting is the resort of Numana (Numana), located about 30 km south of Ancona - in the Russian market it is not represented. There is a clean sea and very large sand, something like small gravel, steep descent, sometimes there is a big wave - children like it. Near the resort there are the grottoes of Frasassi.

The third week: Mothers with children can spend in Vieste - this is the peninsula Gargano - national park. Here is a good clean sea. Less is far to come back. But since there will be only four people, this is one machine and it is not a problem to negotiate a transfer. This is if the Adriatic.

If the Tyrrhenian Sea, then:

In this region I recommend Terracina or Maratea. Both that, and another - beach rest. The sea is good. Also north, near Follonica is a very pleasant resort with a small number of hotels, but with apartment complexes - Punta Ala. The beaches here are excellent.

North of Grossetto - the resort of Orbetello is located .This is a small seaside town, where there is a lot of fish cuisine and peculiar, but clean beaches .Further north, on the Ligurian coast, in my opinion, the best resort is Alassio .To begin a trip better from the north (by the whole company) .Excursions from Allacio: Genoa, San Remo, Monaco, Nice, Cannes .Also nearby the resort there is a large and beautiful cave .Then you can go south and a week to visit Pisa, Florence, Siena and San Gimignano .Well, last week mothers with children can relax in Maratea or Terracina .