It's very beautiful indeed. Fly into Verona airport, it's a part military airbase and if your lucky youl'l see Italian airforce people looking so so coool in their uniforms and shades (women to). Very sharp and sophisticated Milanese on their way home too
Go to Limone for the lemon groves, Torri, for the markets and Moorish Castle, Malcesine for the village and cable car into the mountains and Garda for a general look around. Avoid Sirmione and the bottom end of the lake which is much overated and very busy with tourists and flash gits from Milan on the lake boating. Maderno is plain dull
Also go to Verona for Romeo and Juliets balcony and the opera in the old Roman amphitheatre which is wonderful. The way the Italians love the Opera is really quite moving to see
Avoid day trips to Venice, it's to far and you will get run around the hotspots which is tiring and doesn't do it justice
Food is great, particularily seafood but avoid the "menu Touristico" which is ****. There's a bar run by an English woman in Malcesine that does lovely food but without the language barrier, you can sit in her gardens and watch the ferry come and go on the lake, if you want il'l try and remember how you get there from the ferry
It gets very hot in summer far warmer than the uk so mid September should be lovely, but don't swim in the lake unless your brave, it's glacial melt water and gets terrifyingly deep really fast
It's easy for the Germans and Austrians to get there over the Brenner pass so there isn't as much Italian atmosphere as you might want, in fact they spoil it
Like anywhere in italy it's not cheap