A lot of it comes down to insurance. How many of you are going? best opption may be to take it in turns looking after him, don't know if you will get skis and boots to fit him though
I wouldnt leave my 2 year old with anyone except an established kiddies club/creche. I hope that others have the same feelings. Remember that Bulgaria still has its shady side and you wouldnt want your child being sold in Sofia for a couple of thousand lev