Pinarello is in Treviso, about 30 minutes by train from Venice. They have a showroom in town: I've never been, but others have said there's always a member of the family present, and sometimes you might even be lucky enough to see the old man himself in the store. Wilier is in Rossano Veneto, take a train for Bassano del Grappa or Trento (Bassano is on the way there) and disembark at Rossano. Here's a Google Map
link for a route from the train station to Wilier, with Street View of the building.
Hard to say what a "must ride" is w/o knowing what kind of riders you are. If you want a climbing challenge with rewarding views over the Venetian plain and hang-gliders soaring nearby, climb Mt. Grappa just outside of Bassano. The classic climb from Romano d'Ezzelino to the military monument at the peak is 25 km (15 mi) and 1558 m (5112 ft) of climb—elevation profile here
. There are many steeper variations including a real leg buster going up from near Crespano del Grappa via "il salto della capra" (the goat's leap), which most mortals do on MTBs for their low gearing even though it's paved all the way.
The Venetian mainland (Veneto) is a hotbed of bicycle and bicycle component/accessories manufacturing, accounting for 80% of Italy's bicycle-related production. See my set of links to cycling brands in the Veneto
. Note that not everyone welcomes visitors: Campagnolo is notoriously secretive and you need some kind of personal connection (or be someone famous) to be granted a visit; Sidi is just a non-descript building (with no showroom) along a provincial road.
Last edited by dorkypants; 04-01-12 at 10:52 AM.
Reason: add more info on Veneto bike links