We fly out on 13th Jan for a week - our first ski trip abroad. Normally manage 1 or 2 days in Cairngorms, and have only managed 1 day when we could ski the whole mountain in 3 years!!
There is a bowling alley in the Perelik (7levs a game and no electronic score board) and one one night they do a bowling special based on the flintstones with various wacky prizes.
Hotels have swimming pools and video / games machines. Some have pool tables
There is a trip to a monestery
There is also a trip to Plovdiv
Not much more that I know of as the resort was purpose built as a ski resort and most entertainment is scheduled for after skiing.
Pray for snow.