Just got back from Val Gardena, stayed in the St. Cristina area, have 2 young children (4&3) and we weren't that impressed. For a cheaper flight and probably less drive time, we could have gone to the Swiss Alps and found a ton more things to do if skiing was the only thing on our to-do list, or chosen other areas of Italy if getting the Italian experience was another choice.
A few helpful parenting tips when visiting Val Gardena:
1)your children may get car sick on the drive up and down the mountain
2)your children will experience levels of altitude sickness (ears popping, exhaustion, dehydration)...but that is typical of any mountain trip
3)the town shuts down, literally, from 12:00 to 15:00, so be sure you get lunch beforehand at one of the few restaurants that are located here and stock up on any necessities at the one and only grocery store before this time too.
4)reschedule their naps to coinside with this town-shut-down because once things are back up and running at 15:00, there isn't much to do before it shuts down again at 20:00.
1)note that there are tolls on the highway to the mountains from Milan, if that is where you are coming from
2)there are no physical addresses to Cesa's or places we found, so it's hard to navigate with a GPS, and especially hard if you're arriving during the afternoon siesta or night closings since you can't ask around. If it weren't such a wintery place, I would expect a tumbleweed to blow through & the theme from The Good, The Bad & The Ugly to be playing in the background.
3)altitude sickness boggles the minds of ski instructors, at least the one I had.
4)the slopes are completely empty and it is surprising that the gondolas actually run with no one around to take them...maybe it was because it was during siesta time, but normally in ski areas, these hours have the highest activity, at least where we've traveled.
5)there is no where to park unless you pay, and you can't pay for over 1 hour, so repeated trips to the machine & car is necessary. Of course the town is barely open so this may not be necessary as there is nothing to do.
So, my overall view, yeah, it's pretty, but there is really nothing to do, you'll visit the same restaurant or cafe again and again because there isn't much choice and you have to cram things you want or need to do in the short amount of time that you're given.
Wouldn't personally pick this as a vacation spot again, IMO. Thankfully it was a gift from the company, unfortunately it felt like a half-eaten fruit basket kind of gift instead of a fun getaway.