I have the following suggestion for your trip to Northern Italy in August.
Arrival in surrounding of Lago Maggiore (distance from Brussel app.. 860 km) The journey starts at Lago Maggiore during 3 nights.
Lago Maggiore en Lago d’Orta
A great begin of the journey is Lago Maggiore with colourful gardens and the Borromeïsche islands near Stresa like Isola Bella.In the neighbourhoo is also Lago d'Orta. You can visit Orta or the island San Giulio.
Como Lake is the place to visit. The gardens at the lake and the little city Bellagio are the things to see here. It is the crossing with three arms of the lake. Don't feel like a lake anymore, you can go to Milan and do some shopping around there, You can also visit the Duomo en Leonardo da Vinci Master Piece.
Lago Maggiore – Gardameer (ca. 190 km)
Greatest Lake of Italy, the Garden Lake, you will be staying during 3 nights, The city of Bergamo is a city where art is around. Especially the medival Citta Altahas been well preserved. Iseo is a smaller lake with a island in the middle of it Mount Isola.
Day5 Garda Lake.You can drive around the Lake. Citys like Sirmione, Riva, Malcesine of Garda you can visit. The way is sometime spectaculair near Limone, sometimes sweet and adorable like in the neigbourhood of Bardolino.
One of the most beautiful citys of Italy is Verona. Famous for the Arena, used for the operaplays during the Summer and of course the story of Romeo and Juliette.
Garda Lake – Venice (ca. 140 km) The last 3 nights you wll be staying near Venice. Today you will see the mountainlikes of the Valle dei Laghi, the beautiful city of Trento and theLevico and Caldonazzo lakes, in the middle of the Dolomites Mountains.
Venice A city of water. With the canals, San Marco square and the various islands.
Brenta and Padua you will be visiting them today. Rich Venetian people build their palaces here to relax. Die sfeer is behouden gebleven.
End of the journey distance to Brussel app. 1160 km)
You can also extend your stay with a few nights.
The region is also a good place to bike and make nice journeys around the lakes
Price for the roundtrip in August: € 489.- per person with bed and breakfast. You drive with your own car to the region. I have found this trip with Vrij Uit reizen in Holland. If you have questions about this please do not hesitate to mail me on firstname.lastname@example.org