I love UCSD! The welcoming atmosphere, the interesting class, and all of the clubs and orgs you can be a part of. I've already made some amazing friends here, joined cool clubs, attended fun events, and learned quite a bit in class. I'm especially a fan of the 6-college system, because it creates the feel of both a small college and a big university in one place.
My only critique would be that the prices are quite high. For everything. Food is expensive, tuition, activities, and the like. It makes it especially hard for an out-of-state student to make it here.
Also, I love the fact that the school is not much of a party school, because I was looking for a university where I could hang out and party, and still feel safe. Everyone is still friendly and wonderful, and it also makes it easier to study and find cool ways to spend your time.