Niagara wine tour for intimate 20th birthday celebration?

So i am looking to celebrate my 20th birthday a little earlier this year (since my birthday in in December and its kind of cold to do anything outside)... but i love wine and have always wanted to go to Niagara wine country... i'll be celebrating with my mother, father, and lovely fiance... but we don't want to spend TOO much money and we were looking for a DAY tour during September or early October... Does anyone have any personal referrals to a certain wine tour group or any suggestions??? THANKS GUYS!