ive never been, but doesnt Sensatori have a whole loads of kids facilities, including free supervised kids club?
In other words, there's a lot more for a 4yo to do here than on a "standard" package holiday.
And in my opinion, kids seem to love being abroad, regardless of "things to do". It's all about just doing anything they dont normally do. A swimming pool or beach is usually enough for kids to be happy with for 2 weeks!