What do you think of these schools?

They're all great and you should be proud to attend any one of them. If you attend Dartmouth obviously you get the allure of being able to say you're in an Ivy League, if that matters to you. Colgate is great but just be ready for cold weather. I also hear that sorority and fraternity life are very prominent on Colgate's campus. You can decide for yourself if that is a pro or con. Georgetown gives you the opportunity to be right by the country's capital and depending on what your studying and what your interests are this could be very rewarding. I hear Vanderbilt is very nice but known to be a formal school at which "Both guys and girls have a huge amount of pressure to be attractive and stylish." Plus the Greek Life dominates Vanderbilt social life as well.