We went pre kids and its a great place. Lots to see and do. Food is great too.
Swimming boating on the lake(s). Mountain climbing too. Lake Bohinj is also worth a visit. We walked up the mountain next to it to the ski station, got the chairlift down and then the ferry on the lake. It was quite easy to hire bikes there too.
We also went down the old mercury mine at Idrija, which was very impressive.
The caves in the Karst region are very impressive too.
The Bee museum is also worth a trip.
We stayed in three places; Lake Bled, Hudicevec tourist farm[/url] and Llubljana.
Canyoning in a thunderstorm (Lake Bled/ Bohinj area) was also quite a rush, but may not be advised.