One of the most beautiful nights in the Dolomites was at the 5 torri cable car. The evening atmosphere was very pleasant, as if we were in a camp. In the morning we waited until 9am and took the chairlift up to Rifugio Scoiattoli . Price: €25/person, children free. 
We have been to the 5 torri open-air museum... well... practically every year since we have been going to the Dolomites. We managed to go a few times on the first Sunday of August . That is when the museum is full of WWI fans. They are fans who are equipped and dressed like soldiers sometimes and walk around the museum. I really recommend visiting this location then, a fantastic experience, as if the front came to life only without the explosions and danger.
So we've walked around the museum several times. The first year we did a circular route around the stone towers (and this year we did the same at the end). The tour of the museum itself will take you about an hour. It depends on how interested you are. The path through the trenches and ditches is easy and quite popular.
We (especially me :D) wanted to see and experience something else this year. A suitable tour around there is the climb to two huts. First to the Averau hut (path no. 439 ), 30 minutes walk, 180 elevation gain. Then about 30 minutes to the Nuvolau hut (2575m). The path to the Averau hut is a path or you can also go along a wide gravel road. From the saddle and the Averau hut towards the Nuvolau hut, be a little more careful on the rocks. The path is otherwise undemanding and very scenic, well marked. We liked it a lot. From the Nuvolau hut there is a nice view of Passo Giau. The path is very busy, so, again, go early.
Complete tour: Rifugio Sciattoli (2255m) - Rif. Averau - Rif. Nuvolau (2575m).
4.5km, 320 elevation gain, almost two hours of walking (up and down). Great option with children.
Maybe we'll manage to avoid the chairlift next time we visit? Let's hope so... :) 