I've heard of some nice restaurants. Also if you want to add a bit of culture, theres the rila monastry looks quite nice from the pictures.
Sorry don't know what the Samkov is like Im staying i the rila.
Kids are welcome everywhere in Borovets - remember its their holiday too!
The Samokov is a great hotel, swimming pool, bowling ally,pool table, thats just for starters.
Breakfast is great but evening meals could be better, I just eat out every night as there are restaurants to choose from.
Have fun & enjoy your holiday
Paul