I’m with acraven on using Ortisei as your base for the Dolomites area. I was there in late August for four nights, and it offers lots of opportunities for both hiking and day tripping, although a car would be needed to get the most out of your day trips. A day in Bolzano would be a must. Note that there is another town nearby with a very similar name to Ortisei- look for Ortisei/Sankt Ulrich, or Urtijëi. There’s lifts from the town into the mountains in three different directions, on either side of the valley, with trails for all tastes. There are the two cable cars mentioned by Marika, but if you’re not really into lots of hiking, I’d recommend taking the Rasciesa funicular. It offers a fairly easy, flat hike along a ridge with some spectacular views of the valleys. The town also has a great community pool complex which would keep the kids (and parents) entertained for hours. There’s about eight different pools, indoors and out. Many hotels include free passes to the complex, so ask when booking. Another thing you might want to consider is flying into Verona, rather than Venice. The routing from Trudeau airport is the same for both- generally through either Frankfurt or Munich- but the drive to Ortisei is shorter from Verona. If you planned on spending the first few days of your trip in Venice, it makes sense to land there, but Verona also makes a nice first stop for visiting the northern part of Italy.