This took us all the way to Bolzano, but not seeing any clear signs that the route continued, we headed to the road going south out of town, eventually finding that it was a "no cycles" road. There appeared to be no way south for cyclists! Fortunately, John then saw a roadside map of the area which showed a cycle route on it. We followed a route to get on to it, only to find that, within a few hundred metres of our goal, road works had blocked off access... Much frustration - we were beginning to believe that we were trapped! Once again, fortunately I had taken a photo of the map so we managed to work out another possible route - and this one worked. This took us on the same, defense-top route as before, all 55 km to Trento.
We found out from talking to a couple of very helpful runners that there wasn't a camp site at Trento as we thought there should be from the map, so we ended up at the youth hostel at about 7:30 pm. It was full. So was the hotel that we tried next. Then we went looking for some B&B's. No luck! We were beginning to think we'd have a night on a park bench when we were rescued by an elderly gentleman who appeared on a bike. He preceded to trail us through the town, riding Italian style (ie. ignoring traffic lights, one way streets and generally bossing the other traffic around) until we found a hotel with a room, though it was a bit pricey for our budget. No problem for our rescuer, who then negotiated our price down and finished by recommending the best route for tomorrow. Amazing! So after 2 hours searching, we ended up, at 9:30pm, finally with a room, and extremely grateful for our knight in shining armor. We've managed to get food now, and Jeremy is going to put his iPad to work looking for route options on our revised plan.
Later update: 5767 calories used