EuroSprint specializes in tours of Europe. Their Trentino, Dolomites and Austria tour covers the gorgeous scenery of Northern Italy on a five day excursion. The fourth day of the tour includes a full day in Trento and gives you time to take in many of the towns sights.
Eurosprint
eurosprint.com
For a romantic tour join Venice Honeymoons Cellar Tours. A private chauffeur takes you around the Veneto region for food and wine sampling. On day six of the ten day tour your driver takes you around Lake Garda during which you can see Trento. On day eight you will spend an afternoon in Trento.
Venice Honeymoons
cellartours.com
If you want to see the countryside of Italy by bike hidden Trails Verona to Venice Tour is an eight day tour that takes you from Bolzano to Venice. The second day brings you cycling into Trento where you will stay the night.
Hidden Trails
hiddentrails.com
If you want to get back to nature while in Italy you can camp along Lake Ledro with Camping Al Sole. While on your camping trip you can join their escorted tours of Trento, Verona or Venice.
Camping al Sole
campingalsole.it
Some hotels along Lake Garda and in Venice offer tours to Trento and other towns in the region. When booking your stay, check out various hotels' web sites to see what they offer. Even if they don't offer tours through the hotel, they may be able to recommend somewhere in town that does.