Bring a large pot of lightly salted water to a boil.  Stir in pasta and cook for 10 minutes: drain. 

     Cook bacon over medium high heat until crisp.  Drain and chop.

     In a large bowl, mix mayo, pasta, ranch mix and garlic.  Stir in milk until smooth.  Place bacon, tomatoes and cheese in a bowl and toss to coat dressing. 

     Cover and chill for at least 1 hour in the refrigerator.